脱式计算（能简算的要简算）0.75×4×0.25×49.6+9.9×9915.58÷8.2-0.724.536÷0.8÷142.8×3.6+1.4×2.86.3×10.1．

Question

脱式计算（能简算的要简算）

0.75×4×0.25×4	9.6+9.9×99	15.58÷8.2-0.72
4.536÷0.8÷14	2.8×3.6+1.4×2.8	6.3×10.1．

Answer 1

（1）0.75×4×0.25×4
=（0.75×4）×（0.25×4）
=3×1
=3
（2）9.6+9.9×99
=9.6+9.9×（100-1）
=9.6+9.9×100-9.9
=9.6+990-9.9
=989.7
（3）15.58÷8.2-0.72
=1.9-0.72
=1.18
（4）4.536÷0.8÷14
=5.67÷14
=0.405
（5）2.8×3.6+1.4×2.8
=2.8×（3.6+1.4）
=2.8×5
=14
（6）6.3×10.1
=6.3×（10+0.1）
=6.3×10+6.3×0.1
=63+0.63
=63.63