方程两边同时除以3.2,得x+x-15=135移项,合并同类项,得2x=150系数化为1,得x=75
3x-5=103x=10-(-5)3x=15 x=5
3.2*(1.5*x)=16解:1.5*x=16÷3.21.5x=5x=5÷1.5x=10/3
3.2x十3.2十x=4.2x+3.2
3.2x-2.4x = 10+20.8x = 12x=15
450
4÷(3.7一x一3.2)=103.7一x一3.2=0.40.5-x=0.4x=0.1
3.2十x=6.5 x=6.5-3.2 x=3.3 很高兴为你解答满意望采纳
两边同时乘以3.2 x=32
郭敦回答:设每本成本价x元,则10(4-x)=15(3.5-x)15x-10x=52.5-405x=12.5,x=2.5(元)10(4-2.5)+15(3.5-2.5)+(300-10-15)*(3.2-2.5)=15+15+275*0.7=30+192.5=222.5(元)商店售300本笔记本共获利222.5元.