Question

4+0÷9的脱式计算

脱式计算（能简算的要简算） 0.75×4+0.25×4                    9.6+9.6×99 2.8×3.6+1.4×2.8                  6.3×10.1 9.1÷1.25×0.2                     5.82÷0.05÷0.8

Answer 1

（1）0.75×4+0.25×4 
=（0.75+0.25）×4
=1×4
=4

（2）9.6+9.6×99
=9.6×（99+1）
=9.6×100
=960

（3）2.8×3.6+1.4×2.8 
=2.8×（3.6+1.4）
=2.8×5
=14

（4）6.3×10.1
=6.3×（10+0.1）
=6.3×10+0.1×6.3
=63+0.63
=63.63

（5）9.1÷1.25×0.2
=7.28×0.2
=1.456

（6）5.82÷0.05÷0.8
=5.82÷（0.05×0.8）
=5.82÷0.04
=145.5