方程X=(X+50+70+70)*(3/5)怎么解
问题描述:
方程X=(X+50+70+70)*(3/5)怎么解
答
X=(X+50+70+70)*(3/5)
5x=3(x+190)
5x=3x+570
5x-3x=570
2x=570
x=285