66X23十22X31
=22X3X23十22X31
=22X(3X23+31)
=22X(69十31)
=22X100
=2200
66x23+22x31
=22x3x23+22x31
=22x69+22x31
=22x(69+31)
=22x100
=2200
用拆分法,分配律
=22x3x23+22x31
=22x69+22x31
=22x(69+31)
=22x100
=2200
66×23+22x31
=22x3x23+22x31
=22x(3×23+31)
=22x(69+31)
=22x100
=2200
解:原式=22x3x23+22x31
=22x(3x23)+22x31
=22x69+22x31
=22x(69+31)
=22x100
=2200