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简便方法计算题1/2×2/5+9/25÷9/20

1/2×2/5+9/25÷9/20 =1/5+9/25×20/9 =1/5+4/5 =1

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解:(5/8+1/25)×15+9/25 =75/8+(15/25)+(9/25) =(75/8)+25/25 =9.375+1 =10.375

9/5×25%+1/4×2.2-0.25 =(9/5+2.2-1)×1/4 =3×1/4 =3/4

①375+450÷18×25,=375+25×25,=375+625,=1000;② 19 5 × 1 9 + 1 5 ÷9,= 19 5 × 1 9 + 1 5 × 1 9 ,= 1 9 ×( 19 5 + 1 5 ),= 1 9 ×4,= 4 9 ;③[6.85-(0.65+0.7)]÷2.5;=[6.85-0.65-0.7]÷2.5,=5.5÷2.5,=2.2;④ 3 10 ÷( 5 2 - 5 3 )×...

1. 3/4-3/4÷3+9/25 =3/4-3/4×1/3+9/25 = 3/4-1/4 +9/25 =1/2+9/25 =25/50+18/50 =43/50 2. 2/3÷1/2-5/3×2/5 = 2/3×2-2/3 = 2/3×(2-1) = 2/3 3. 2÷[(1+2/5)×3/7] = 2÷(7/5×3/7) = 2÷3/5 = 2×5/3 =10/3 4. 5/8×3/4+1/4×5/8+5/8 = 5/8 ×(3/4+ 1/4...

(1)1880×201.1-187.9×2011,=188×2011-187.9×2011,=(188-187.9)×2011,=0.1×2011,=201.1;(2)25×5÷25×5,=25÷25×5×5,=1×5×5,=25;(3)89×[34?(716?25%)],=89×[34-(716?14)],=89×[34?316],=89×916,=12;(4)7.2×61310+73.8×245...

17.8-20.4×1/5 =17.8-4.08 =13.72 直接计算 25%×8/9+3/4÷9/8 =1/4×8/9+3/4×8/9 =(1/4+3/4)×8/9 =8/9 乘法分配律 供参考

144又25分之12÷12 =(144+12/25)×1/12 =144×1/12+12/25×1/12 =12+1/25 =12又1/25 (9又7分之2+7又9分之2)÷(7分之5+9分之5) =(9+2/7+7+2/9)÷(5/7+5/9) =[16+2×(1/7+1/9)]÷[5×(1/7+1/9)] =[16+2×16/63]÷[5×16/63] =16÷(5×16/63) +(2×16/63...

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