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

①0.75×4×0.25×4，
=0.75×（4×0.25）×4，
=0.75×1×4，
=3；

②9.6+9.9×99，
=9.6+980.1，
=989.7；

③15.58÷8.2-0.72，
=1.9-0.72，
=1.18；

④4.536÷0.8÷14，
=5.67÷14，
=0.405；

⑤2.8×3.6+1.4×2.8，
=（3.6+1.4）×2.8，
=5×2.8，
=14；

⑥6.3×10.1，
=6.3×（10+0.1），
=6.3×10+6.3×0.1，
=63+0.63，
=63.63．