137×9+163×9简便计算?解:原式=9×(137+163)=9×300=2700运用乘法结合律计算
137×9+163×9=(137+163)×9=300×9=2700
137×9+163×9=9x(137+163)=9x300=2700
137×9+163×9=9×(137+163)=9×300=2700