脱式计算，能简算的要简算．0.7×101-0.70.125×4.7×84280×7.8+572×784×6.32×2.512.5-1.68-2.32567÷20÷515.73-（2.17+0.73）-1.8312.5×2.5×0.8×4．

Question

脱式计算，能简算的要简算．

0.7×101-0.7	0.125×4.7×8	4280×7.8+572×78	4×6.32×2.5
12.5-1.68-2.32	567÷20÷5	15.73-（2.17+0.73）-1.83	12.5×2.5×0.8×4．

Answer 1

①0.7×101-0.7
=0.7×（101-1）
=0.7×100
=70

②0.125×4.7×8
=0.125×8×4.7
=1×4.7
=4.7

③4280×7.8+572×78
=428×78+572×78
=（428+572）×78
=1000×78
=78000

④4×6.32×2.5
=4×2.5×6.32
=10×6.32
=63.2

⑤12.5-1.68-2.32
=12.5-（1.68+2.32）
=12.5-4
=8.5

⑥567÷20÷5
=567÷（20×5）
=567÷100
=5.67

⑦15.73-（2.17+0.73）-1.83
=15.73-2.17-0.73-1.83
=（15.73-0.73）-（2.17+1.83）
=15-4
=11

⑧12.5×2.5×0.8×4
=（12.5×0.8）×（2.5×4）
=10×10
=100