Question

2.88÷[(2.8-1.9)×0.4]怎么简算？

Answer 1

简便运算主要是通过交换律、结合律，将相关数字交换结合，凑成整数，达到速算目的。但此题不具备这些特点，没有明显的简算方法。
2.88÷[(2.8-1.9)×0.4]
=2.88÷(0.9×0.4)
=2.88÷0.4÷0.9
=7.2÷0.9
=8

Answer 2

2.88÷（（2.8-1.9）×0.4）=2.88÷（0.9×0.4）=2.88÷0.9÷0.4=3.2÷0.4=0.8

Answer 3

（1）[（5.1-3.6）÷0.8-1]×0.09
=[1.5÷0.8-1]×0.09
=[1.875-1]×0.09
=0.875×0.09
=0.07875

（2）98.4×98+98.4×2
=98.4×（98+2）
=98.4×100
=9840

（3）30.1÷[（6.07+2.53）×0.7]
=30.1÷[8.6×0.7]
=30.1÷6.02
=5

（4）0.94×2.5+0.094×75
=0.94×2.5+0.94×7.5
=0.94×（2.5+7.5）
=0.94×10
=9.4

（5）（77.4-3.096÷0.4）÷0.03
=（77.4-7.74）÷0.03
=69.66÷0.03
=2322

（6）9.28×13-9.28×4+9.28
=9.28×（13-4+1）
=9.28×10
=92.8

（7）97.2÷[（54.8+45.2）×（6-5.46）]
=97.2÷[100×0.54]
=97.2÷54
=1.8

（8）1.25×32
=1.25×8×4
=10×4
=40