小數簡算

小數簡算


整數的簡便運算在小數上也可以運用(五年級知識)
乘法結合律:a*(b*c)=(a*b)*c
乘法交換律:a*b=b*a
乘法分配律:a*b+a*c=a*(b+c)
加法交換律:a+b=b+c
加法結合律:a+(b+c)=(a+b)+c
減法的運算性質:a-b-c=a-(b+c);a*b-a*c=a*(b+c);
除法的運算性質:a/b/c=a/(b*c)
……
要小數乘小數的懶得去找資料了,就將記得的列幾例給你吧..1)2.8×1.5=1.4×3=4.2這是一類比較直觀的簡便計算方法.
(7.2×4.5×8.1)÷(1.8×1.5×2.7)
=7.2×4.5×8.1÷1.8÷1.5÷2.7
=(7.2÷1.8)×(4.5÷1.5)×(8.1÷2.7)
=4×3×3
=4×9
=36
8.7-8.5+8.3-8.1+7.9-7.7+7.5-7.3+7.1-6.9
={(8.7+8.3)+(7.9+7.1)+7.5}-{(8.1+6.9)+(7.7+7.3)+8.5}=1
簡便算灋就是把結果相加或相减後能得出整數的2個數放到一起計算



急求小數乘除法口算題250道
只有一天時間了


請先給出2~4個樣例



一定要有答案的,口算22頁後面的答案,
要正確,不正確不要,現在是第25頁以上了


第41片:1.45分之1 2.63分之1 3.2分之1
4.3分之2 5.3分之1 6.10又2分之1 7.2分之1 8.1又4分之3 9.15又10分之1
10.2又8分之1 11.13又7分之5



3.2*10%=、50/1=、1+12%=、8/5-37.5%=、1.6/40%=、0.16*10%*100=
要寫計算過程,第2個是50/1%


=3.2*0.1
=0.32
=50/0.01
=5000
=1+0.12
=1.12
=8 / 5-0.375
=1.6-0.375
=1.225
=1.6 / 0.1
=4
=0.16*0.1*100
=0.016*100
=1.6



多點口算.百分數,小數,分數都可以.分數多一點.



3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
17×40=100-63=3.2+1.68=2.8×0.4=
14-7.4=1.92÷0.04=0.32×500=0.65+4.35=
10-5.4=4÷20=3.5×200=1.5-0.06=
0.75÷15=0.4×0.8=4×0.25=0.36+1.54=
1.01×99=420÷35=25×12=135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17=32.8+19=5.2÷1.3=1.6×0.4=
4.9×0.7=1÷5=6÷12=0.87-0.49=
(4)396×[74-(4875÷15-13×21)]
(5)[1054-(174-168)]÷8
(6)6048÷[(107-99)×9]
够嗎?o(∩_∩)o



5/4*3/5=
5/4÷5/3=
0*5/11=
0÷3/2=
1/2*6=
6÷1/2=
1/10÷7/10=
28*7/4=
4/7÷4=
4/7÷8=
3÷1/10=
3/5÷1/5=
1/3÷4/3=
5/8*8/5=


5/4*3/5=0.75
5/4÷5/3=0.75
0*5/11=0
0÷3/2=0
1/2*6=3
6÷1/2=12
1/10÷7/10=1/7
28*7/4=49
4/7÷4=1/7
4/7÷8=1/14
3÷1/10=30
3/5÷1/5=3
1/3÷4/3=1/4
5/8*8/5=1



\(分號)
1\3*1\4=
4\25÷4\5=
1\4÷1\8=
1-1\5=
7\12+1\‘12=
5\12*6\5=
2\14*3=
2\5*1\4=
7\20÷4\15=
5*1\7=
5\6*3\5=
3\4+3\4=
2\3-1\6=
1÷3\4=
5\7÷5\2=


1\12
1\5
2
4\5
2\3
1\2
6\14
1\10
21\16
5\7
1\2
3\2
1\2
4\3
2\7



六年級上册口算題卡冀教版答案
求求你們,我實在忍受不了啦!


無能為力



(1)圓柱的底面積是3.2平方分米,側面積是6平方分米.求表面積的算式是().
(2)圓柱的底面半徑是4釐米,高是10釐米,求圓柱表面積的算式是().
(3)圓柱的底面直徑是9釐米,高是12釐米,求圓柱表面積的算式是().
(4)圓柱的底面周長是12.56釐米,高是2釐米,求圓柱表面積的算式是().
幫個忙,別抄別人的,以為說點東西我就不知道啦。(數學老師也曾說過我們抄重點難點的同學)(*^__^*)…嘻嘻,要精確的。


1.側面積+2倍的表面積=6+6.4=12.4
2.底面周長×高=2×4×π×10=80π=251.2
3.底面周長×高=9×π×12=108π
4.
12.56×2=25.12



包括(遞等式解方程分數運算.)越多越好
今天之內