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2.5*3/4+7.5*0.75简便运算

2.5+7.5*4*16 =2.5+30*16 =482.5

75%+3/4*59-0.75 =3/4*(1+59-1) =3/4*59 =3/4*(60-1) =45-3/4 =44又1/4

6.26×7.5+0.75×37.4 =6.26×7.5+7.5×3.74 =(6.26+3.74)×7.5 =10×7.5 =75

6.25×7.5+0.75×37.4 =6.25×7.5+7.5×3.74 =7.5×(6.25+3.74) =7.5×9.99 =7.5×(10-0.01) =7.5×10-7.5×0.01 =75-0.075 =74.925

结果等于3/4,算法为:将共有的3/4提出来,剩下的2/5和3/5相加,最后得出结果。 运算法则: 加法交换律:两个加数交换位置,和不变 加法结合律:先把前两个数相加,或先把后两个数相加 乘法交换律:两个因数交换位置,积不变 乘法结合律:先乘前...

7.5*2.3+1.9*2.5+12.5*0.4 =2.5*3*2.3+1.9*2.5+2.5*5*0.4 =2.5*(6.9+1.9+2) =2.5*10.8 =2.5*(10+0.8) =2.5*10+2.5*0.8 =25+2 =27

3\4×0.4+0.75×3\5 =3/4×(2/5+3/5) =3/4

(4.36 + 3.64 + 2) * 2.5 = 10 * 2.5 = 25 1+ 2/7 + 7/9 - 2/7 + 2/9 = 2 (5/7 - 1/2) / (10/21 - 3/10) = ((5*30)/(7*30) - 105/(2 * 105))/((10 * 10)/(21*10) - (3*21)/(10*21))=(5*30-105)/(10*10-3*21)=(150 - 105)/(100 - 63) = 45/27 = 5...

0.75化成 分数为3/4 原式=3/4+3/4x 5/8-3/8x3/4 (提取公因式3/4) =3/4(1+5/8-3/8) (将括号内的进行加减计算) =3/4x4/5 (约分) =3/5

0.78+4*3.75 =0.78+4*(3+0.75) =0.78+12+3 =0.78+15 =15.78

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