㈠ 48乘99簡便脫式計算
48乘99簡便脫式計算原式=48*99=48*(99+1-1)=48*100-48=4800-48=4752
㈡ 48乘99用簡便方法計算
48乘99=48×(100-1)=48×100-48=4800-48=4752