80.1-0.99簡便計(jì)算
=80.1-(1-0.01)
=80.1-1+0.01
=79.11;
0.74×99簡便計(jì)算
=0.74×(100-1)
=74-0.74
=73.26;
45.7×99＋45.7簡便計(jì)算
=45.7×(99+1)
=45.7×100
=4570;
1.08×125簡便計(jì)算
=1×125+0.08×125
=125+10
=135;
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