问几道数学计算题,急,①(-49)×(-32)+(-51)×(+32)②(-8/9)×(-0.25)×(-1/4)×9
问题描述:
问几道数学计算题,急,
①(-49)×(-32)+(-51)×(+32)
②(-8/9)×(-0.25)×(-1/4)×9
答
① 原式=49×32-51×32
=(49-51)×32
=(-2)×32
=-64
② 原式=(-8/9)×9×(-1/4) ×(-1/4)
=(-8) ×(-1/4) ×(-1/4)
=-1/2
答
①(-49)×(-32)+(-51)×(+32)
=32×(49-51)=-64
②(-8/9)×(-0.25)×(-1/4)×9
=-8*9/(9*4*4)=-1/2
答
1.原式=49×32-51×32=(49-51)×32=-2×32=-64
2.原式=-8/9×1/4×1/4×9=-8/16=-1/2.