125x32-125x24
=125x(32-24)
=125x8
=1000
81+9x91
=(91-10)+9x91
=10x91-10
=910-10
=900
运用乘法的运算定律计算题 如下125x32-125x2481+9x91记住是乘法运算定律~格式=xx=xx=xxx
125x32-125x24
=125x(32-24)
=125x8
=1000
81+9x91
=(91-10)+9x91
=10x91-10
=910-10
=900