x+3x=2*(x+300)怎么解大神们帮帮忙
问题描述:
x+3x=2*(x+300)怎么解大神们帮帮忙
答
4x=2x+600 2x=600 x=300
答
x+3x=2x+2*300 4x=2x+600 4x-2x=600 2x=600 x=600/2=300