65×42+36×42-42
=42x(65+36-1)
=42x100
=4200
以上就是简便计算过程。
解: 36X42+36X4+36X18
=36X(42+4+18)
=(40-4)X(46+18)
=(40-4)X64
=(40X64)-(4X64)
=2560-256
=2304
=36×(40+2)+36×4+36×18
=36×40+36×2+36×4+36×18
=36×40+36×4+36×(2+18)
=1440+144+720
=2304
36×42+36×40+36×18
=36×(42+40+18)
=36×100
=3600
36×42+36×4+36×18
=36×(42+4+18)
=36×64
=72×32
=144×16
=288×8
=300×8-12×8
=2400-96
=2304