37*15+21*45,怎样算才简便?

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37*15+21*45,怎样算才简便?37*15+21*45,怎样算才简便?37*15+21*45,怎样算才简便?37*15+21*45=37x15+21x15x3=37x15+63x15=(37+6

37*15+21*45,怎样算才简便?
37*15+21*45,怎样算才简便?

37*15+21*45,怎样算才简便?
37*15+21*45
=37 x15 +21 x15 x3
=37x15+63x15
=(37+63)x15
=100x15
=1500

37*15+21*45
=37*15+21*3*15
=(37+63)*15
=100*15
=1500

37*15+21*45
=37*15+21*15*3
=15*(37+21*3)
=15*(37+63)
=15*100
=1500

37×15+63×15=37×(37+63)=3700