1 5x=80乘以0.5-9 x=41/92 5x=9x-64 x=163 15乘以6=5x-10 x=164 76乘以0.5=4x+6 x=8 1 （38.5+x）乘以32=2400 x=36.52 （45+x）乘以5+25=450 x=40好了