6.3*10.1簡便計算
6.3×10.1=6.3×(10+0.1)=6.3×10+6.3×0.1=63+0.63=63.63
10又3/4*9又1/4簡便計算
=(10+3/4)*(10-3/4)
=10²;-(3/4)²;
=100-9/16
=99+7/16
=99又7/16
5分之2×18+0.4×32用簡便計算怎麼算
5分之2×18+0.4×32
=0.4×(18+32)
=0.4×50
=20