3.2×(x+1.5)=8.64解:x+1.5=8.64÷3.2x+1.5=2.7x=2.7-1.5x=1.2
3.2(x+1.5)=8.64解:x+1.5=8.64÷3.2 x+1.5=2.7 x=2.7-1.5 x=1.2