Simple operation of 5 / 12-1 / 6 + 2 / 3 Simple operation of 3 / 4 + 4 / 9-3 / 4 + 4 / 9

Simple operation of 5 / 12-1 / 6 + 2 / 3 Simple operation of 3 / 4 + 4 / 9-3 / 4 + 4 / 9

5/12-1/6+2/3……
=5/12-2/12+8/12
=11/12
3/4+4/9-3/4+4/9
=（3/4-3/4）+（4/9+4/9）…… Exchange position. Add and subtract the same denominator
=8/9

250 * 16-48048 / 24 what can be calculated simply should be calculated simply
250*16-48048/24

250*16-48048/24
=250*4*4-2002*24/24
=4000-2002
=4000-2000-2
=1998

Simplify 1 + 2sin290 ° · cos430 ° sin250 ° + cos790 °

∵ sin70 ° > cos70 °, that is, sin70 ° - cos70 ° > 0, the original formula = 1 − 2sin70 ° cos70 °− sin70 ° + cos70 ° = (sin70 ° − cos70 °) 2 − sin70 ° + cos70 ° = - sin70 ° − cos70 ° sin70 ° - cos70 ° = - 1

The ratio is 7.5:1 / 2, the simplification ratio is 1.25:5 / 8250g: 2 / 5kg, and the solution ratio is X: 24 / 7 = 0.875:1

The ratio is 7.5:1 / 2 = 7.5 × 2 = 15
The reduction ratio is 1.25:5 / 8 = 5 / 4:5 / 8 = 2:1
250 g: 2 / 5 kg = 250:400 = 5:8
Solution ratio X: 24 / 7 = 0.875:5
5x=24/7×7/8
5x=3
x=3/5

1340*3.4+660*8.2+1.34*2300+134*54+0.66*2900

1340*3.4+660*8.2+1.34*2300+134*54+0.66*2900
=1.34*3400+1.34*2300+1.34*5400+0.66*8200+0.66*2900
=1.34x(3400+2300+5400)+0.66x(8200+2900)
=1.34x11100+0.66x11100
=2x11100
=22200

1340*3.4+1.34*2300+134*54+0.66*2900=
We must use simple calculation

1340*3.4+1.34*2300+134*54+0.66*2900
= 134*34+134*23+134*54+0.66*2900
=134(34+23+54)+66*29
=134*111+1914
=14874+1914
=16788

The calculation method is simple and convenient

1240x3.5+124x51+1.24x1400
=124*35+124*51+124*14
=124（35+51+14）
=124*100
=12400

Half + two-thirds + three-quarters + four fifths + five sixths is for less

1/2+2/3+3/4+4/5+5/6
=5-（1/2+1/3+1/4+1/5+1/6）
=5-（1+9/20）
=4-9/20
=71/20

24 times three quarters is bigger than 24 who is 40 divided by 2:50 times one in two who is 38 times one in four who is 42 divided by one in half who is bigger

24 big 50, 42 big

(six and a half minus three and a quarter) \ (thirteen plus eleven and a fifth)

(six and a half minus three and a quarter) \ (thirteen plus eleven and a fifth)
=2 and 3 / 4 △ 24 and 1 / 5
=11/4÷121/5
=5/44
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