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7.2÷[1.8×(3.4%2.9)]怎样简算

7.2÷[1.8×(3.4-2.9)] =7.2÷[1.8×0.5] =7.2/0.9 =8

解:依题意得算式, 7.2÷1.8×(3.4-2.9) =4×0.5 =2 7.2÷1.8×(3.4-2.9)=2

2.85-(3.4-0.4)÷3 =2.85-3÷3 =2.85-1 =1.75

8.1÷[1.8×(3.4-2.9)] =8.1÷(1.8x0.5) =8.1÷0.9 =9

(1)9.4÷[(1.2+1.3)÷0.25]=9.4÷[2.5÷0.25]=9.4÷10=0.94(2)(1.2+1.8×4)×(7-6.75=(1.2+7.2)×0.25=8.4×0.25=2.1(3)2.65×1.7+13.5×0.17=2.65×1.7+1.35×1.7=(2.65+1.35)×1.7=4×1.7=6.8(4)20.4-0.8×0.4-0.68=20.4-0.32-0.68=20.4-(0....

原式 =2.9×(19╱5-4╱5)÷9╱4 =29╱10×3×4╱9 =58╱15 简算一般会使用分配率进行数的代换,要善于找到能够代换的数,这个是突破口。

(1)3.7+6.3×0.5,=3.7+3.15,=6.85;(2)21.6÷3×(20-19.8),=7.2×0.2,=1.44;(3)2.5×2.9×4×2,=(2.5×4)×(2.9×2),=10×5.8,=58;(4)16.53-3.57-6.43,=16.53-(3.57+6.43),=16.53-10,=6.53;(5)5.28×9.8+0.2×5.28,=(9.8+0...

(1)25×4.4,=25×4+25×0.4,=100+10,=110;(2)7.7×0.16÷7.7×12.5,=7.7÷7.7×0.8×0.2×12.5,=1×0.2×12.5×0.8,=0.2×10,=2;(3)10.64÷(3.7-2.9),=10.64÷0.8,=13.3;(4)4.8×99+4.8,=4.8×(99+1),=4.8×100,=480;(5)47.3+21×(3...

=((1x5x7x8x10)x(2x11)x(3x9)x(4x6))/(27x25x24x22) =2800/25 =112

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