解方程组2x+5y=23 5x-y=17
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解方程组2x+5y=23 5x-y=17
2x+5y=23
5x-y=17
25x+5y=85
2x+25x=23+85
27x=108
x=4
y=5*4-17=3
x=4
y=3
5x-y=17
25x+5y=85
2x+25x=23+85
27x=108
x=4
y=5*4-17=3
x=4
y=3
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