x+2.5-y=7-y 求未知数X y+x+13.2=18+y 求未知数X

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x+2.5-y=7-y求未知数Xy+x+13.2=18+y求未知数Xx+2.5-y=7-y求未知数Xy+x+13.2=18+y求未知数Xx+2.5-y=7-y求未知数Xy+x+13.2=18+y求未知

x+2.5-y=7-y 求未知数X y+x+13.2=18+y 求未知数X
x+2.5-y=7-y 求未知数X y+x+13.2=18+y 求未知数X

x+2.5-y=7-y 求未知数X y+x+13.2=18+y 求未知数X
x+2.5-y=7-y的x等于4.5
y+x+13.2=18+y 的x等于4.8

不会啊

y=0
x=4.5

x=4.5
x=4.8