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(4.8×7.5×8.1)÷(2.4×2.5×2.7)简便计算

(4.8×7.5×8.1)÷(2.4×2.5×2.7) =(4.8÷2.4)x(7.5÷2.5)x(8.1÷2.7) =2x3x3 =18

(4.8x7.5x8.1)/(2.4x2.5x2.7) =(4.8/2.4)*(7.5/2.5)*(8.1/2.7) =2*3*3 =18

原式=8.1÷9=0.9

=4.9x12.1x8.1÷1.1÷0.9÷7 =(4.9÷7)x(12.1÷1.1)x(8.1÷0.9) =0.7x11x9 =7.7x(10-1) =7.7x10-7.7 =77-7.7 =69.3

8.1÷0.9÷0.3 =9÷0.3 =30

1.2乘(2.5除2.4)乘4.8+0.8乘5 = (1.2乘2.5)乘(4.8除2.4)+0.8乘5 = 3乘2 + 4 = 6 + 4 = 10

8.1÷(0.9×0.3) =8.1÷0.9÷0.3 =9÷0.3 =30

2.4*0.19+0.24*8.1 =2.4*0.19+2.4*0.81 =2.4*(0.19+0.81) =2.4*1 =2.4 注:相当于乘法时,前后两项同时乘以10,同时除以10;即前一项小数点后移一位,后一项小数点前移一位,大小不变

5/8 - 1/4 * (8/9 / 2/3) = 5/8 - 1/4 * 8/9 / 2/3 = 5/8 - 1/4 * 8/9 * 3/2 = 5/8 - (1/4 * 8/9) * 3/2 = 5/8 - (2/9 * 3/2) = 5/8 - 1/3 = 15/24 - 8/24 = 7/24

原式 =(3.9÷1.3)×(1.6÷0.8)×(2.7÷0.9) =3×2×3 =18

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