用簡便的方法計算下麵各題 15-5÷12-7/12 2-1/4-1/3-3/4 5/8-(5/8-1/2) 1/5×37%+4/5×37% 1/6÷11/24-3/8×4//11 68-7.5+32-2.5

用簡便的方法計算下麵各題 15-5÷12-7/12 2-1/4-1/3-3/4 5/8-(5/8-1/2) 1/5×37%+4/5×37% 1/6÷11/24-3/8×4//11 68-7.5+32-2.5


15-5÷12-7/12
=15-5/12-7/12
=15-(5/12+7/12)
=15-1
=14
2-1/4-1/3-3/4
=2-1/4-3/4-1/3
=2-(1/4+3/4)-1/3
=2-1-1/3
=1-1/3
=2/3
5/8-(5/8-1/2)
=5/8-5/8+1/2
=1/2
1/5×37%+4/5×37%
=(1/5+4/5)×37%
=37%
1/6÷11/24-3/8×4/11
=1/6*24/11-3/8×4/11
=4/11-3/8×4/11
=4/11(1-3/8)
=4/11*5/8
=5/22
68-7.5+32-2.5
=68+32-7.5-2.5
=100-(7.5+2.5)
=100-10
=90



下麵各題怎樣簡便運算
7分之5+7分之2+6分之1 15分之1×(3分之1+12分之1)4分之1÷(3-13分之5-13分之8)9分之4÷[6分之5-(6分之1+3分之)]


7分之5+7分之2+6分之1=5/7+2/7+1/6=1+1/6=1又1/615分之1×(3分之1+12分之1)=(1/15)(4/12+1/12)=(1/15)(5/12)=(1/3)(1/12)=1/364分之1÷(3-13分之5-13分之8)=(1/4)÷[3-(5/13+8/13)]=(1/4)÷[3-1]=(1/4)÷2=1/89…



用簡便計算計算下麵的題目
用簡便計算計算35*4*35


35*4*35
=5*7*4*5*7
=(5*5*4)*7*7
=100*7*7
=4900



簡便計算下列題目
4.4+4.4×12+13×5.6


4.4+4.4×12+13×5.6
=4.4(1+12)+13*5.6
=4.4*13+13*5.6
=13*(4.4+5.6)
=13*10
=130