脱式计算（能简算的要简算）0.75×4+0.25×49.6+9.6×992.8×3.6+1.4×2.86.3×10.19.1÷1.25×0.25.82÷0.05÷0.8

Question

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