解:656乘27等于( 17712 ) ∵已知需求出656乘27等于多少 X × (Y - Z)= X × Y - X × Z ∴656乘27 = 656 × (30 - 3) = 656 × 30 - 656 × 3 = 19680 - 1968 = 17712 答:656乘27等于17712
656x27=656x30-656x3=19680-1968=17712