Question

脱式计算（能简便运算的要简便运算）①0.25×0.975×40 ②0.89×4.8+0.89×5.2③（8+0.8）×1.25 &nb.

脱式计算（能简便运算的要简便运算）①0.25×0.975×40 ②0.89×4.8+0.89×5.2③（8+0.8）×1.25 ④10-0.38-0.62⑤45.3×101-45.3 ⑥1.25×0.25×8×0.4．

Answer 1

①0.25×0.975×40
=0.25×40×0.975
=10×0.975
=9.75；

②0.89×4.8+0.89×5.2
=0.89×（4.8+5.2）
=0.89×10
=8.9；

③（8+0.8）×1.25
=8×1.25+0.8×1.25
=10+1
=11；

④10-0.38-0.62
=10-（0.38+0.62）
=10-1
=9；

⑤45.3×101-45.3
=45.3×（101-1）
=45.3×100
=4530；

⑥1.25×0.25×8×0.4
=（1.25×8）×（0.25×0.4）
=10×0.1
=1．