x+2.5-y=7-y 求未知数X y+x+13.2=18+y 求未知数X
问题描述:
x+2.5-y=7-y 求未知数X y+x+13.2=18+y 求未知数X
答
x+2.5-y=7-y的x等于4.5
y+x+13.2=18+y 的x等于4.8要方程解呀x+2.5-y=7-y x+2.5=7(两边消去y)x=4. 5y+x+13.2=18+yx+13.2=18(两边消去y) x=4.8