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8/15%0.8÷1.5×5/12

8/15-0.8÷1.5×5/12 8/15-0.8÷1.5×5/12 =8/15-8/15*5/12 =8/15*7/12 =2/15*7/3 =14/45

8/15×(7/12÷2/5)×15/14 =8/15×(7/12×5/2)×15/14 =8/15×35/24×15/14 =7/9×15/14 =5/6

[4/5+0.75×(5/12-0.15)]÷1又1/8脱式计算。 [4/5+0.75×(5/12-0.15)]÷1又1/8 =【4/5+3/4*(5/12-3/20)】*8/9 =(4/5+4/15)*8/9 =16/15*8/9 =128/135

0.8×0.25×0.4×12.5 =(0.8x12.5)x(0.25x0.4) =10x0.1 =1

①(12.5-0.125)×8=12.5×8-0.125×8=100-1=99; ②5.25×15-0.75÷5=(5.25?0.75)×15=4.5×15=0.9;③253×102=253×100+253×2=25300+506=25806;④15÷[(23+15)×15]=15÷[23×15+15×15]=15÷[10+3]=15÷13=15×113=165.

0.8=十分之八 那就等于 (分子分母同时缩小两倍) 五分之四 0.8=0.8/1 =8/10 = (分子分母同时缩小两倍) 4/5 五分之四 = (分子分母同时扩大三倍)= 15分之12 五分之四 = (分子分母同时扩大五倍) = 25分之20

(3.8+3.3÷0.15)×0.12 =(3.8+22)X0.12 =25.8X0.12 =25X0.12+0.8X0.12 =25X0.4X0.3+0.8X0.1+0.8X0.02 =10X0.3+0.08+0.016 =3+0.08+0.016 =3.096 (12.6÷0.5+4.8)÷0.06 =(12.6X2+4.8)/0.06 =(25.2+4.8)/0.06 =30/0.06 =3000/6 =500 9.8/...

194-64.8÷1.8×0.9 36.72÷4.25×9.9 5180-705×6 24÷2.4-2.5×0.8 (4121+2389)÷7 671×15-974 469×12+1492 405×(3213-3189) 3....

302×15-6950÷50 =(300+2)×15-(6950×2)÷(50×2) =300×15+2×15-13900÷100 =4500+30-139 =1391 12÷1.5-2.5×0.6 =8-1.5 =6.5 15分之7÷(1.8-5分之1)×75% =7/15÷8/5×3/4 =7/15×5/8×3/4 =7/32

15/16÷(5/12÷5/8+3/8) =15/16÷(5/12×8/5+3/8) =15/16÷(2/3+3/8) =15/16÷(16/24+9/24) =15/16÷25/24 =15/16×24/25 =3*4/5 =12/5 =2.4

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