Toán Lớp 9: giải hệ : (x-1)(y-2)-(x+1)(y-3)=4
(x-3)(y+1)-(x-3)(y-5)=15
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Toán Lớp 9: giải hệ : (x-1)(y-2)-(x+1)(y-3)=4
(x-3)(y+1)-(x-3)(y-5)=15
Comments ( 1 )
Câu1:xy-2x-y+2-xy+3x+y-3=4
x+5=4
x=-1
Câu 2:xy+x-3y-3-xy+5x-3y+15=15
6x=3
x=1/2