2X+4(X-12)=60 4X-2(50-X)=20 2X+5X+10(50-2X)=240 完整些)

问题描述:

2X+4(X-12)=60 4X-2(50-X)=20 2X+5X+10(50-2X)=240 完整些)

2x+4(x-12)=602x+4x-48=602x+4x=48+606x=108x=108÷6x=184x-2(50-x)=20 4x-100+2x=204x+2x=100+206x=120x=120/6x=202x+5x+10(50-2x)=2407x+500-20x=24020x-7x=500-24013x=260x=260/13x=20