9x-+3×1.5=32.4这个应该是两个方程吧,9x加减 3x1.5 等于32.4?如果是加的话:9x+3x1.5=32.49x +4.5=32.49x=27.9x=3.1如果是减的话:9x-3x1.5=32.49x-4.5=32.49x=36.9x=4.1
9X-3*1.5=32.49X-4.5=32.49X=32.4+4.59X=36.9X=4.1