37*15+21*45,怎样算才简便?
问题描述：
37*15+21*45,怎样算才简便?
答
37×15+63×15=37×(37+63)=3700
答
37*15+21*45
=37*15+21*15*3
=15*(37+21*3)
=15*(37+63)
=15*100
=1500
答
37*15+21*45
=37 x15 +21 x15 x3
=37x15+63x15
=(37+63)x15
=100x15
=1500
答
37*15+21*45
=37*15+21*3*15
=（37+63）*15
=100*15
=1500