56x38的计算:
56x38=2128
56x38的验算:
2128÷56=38
解:56x38等于( 2128 )
∵已知需求出56x38等于多少
X × Y = Z,即X = Z ÷ Y
∴56 × 38
= 56 × (40 - 2)
= 56 × 40 - 56 × 2
= 2240 - 112
= 2128
经检验,56 = 2128 ÷ 38符合题意
答:56x38等于2128
38×56/2128÷38/2128÷56(这是三种办法哦)