简便计算也不太容易,
还不如直接计算,
37×28+63×72=5572。
37×28+63×72
=37×28+(100-37)×(100-28)
=37×28+10000-2800-3700+37×27
=10000-6500+2×37×28
=3500+37×56
=5572
没有简便计算方法:
37×28+63×72=5572
37*28+63*(28+40+4)
=37*28+63*28+63*40+63*4
=28*(37+63)+2520+252
=2800+2520+252
=5572
37*28+63*72
=37*4*7+7*9*72
=7*148+7*648
=7*(148+648)
=7*796
=5572