运用乘法分配律可使运算简便
38×115-38×15
=38×(115-15)
=38×100
=3800
38×115-38×15
=38×(115-15)
=38×100
=3800
38×115-38×15
=38(115-15)
=38×100
=3800
解:38✘115–38✘15等于( 3800 )
∵已知需求出38✘115–38✘15等于多少
X × Y - X × Z = X × (Y - Z)
∴38 ✘ 115 – 38 ✘ 15
= 38 × (115 - 15)
= 38 × 100
= 3800
答:38✘115–38✘15等于3800