Toán Lớp 8: Tìm xx biết:x(x+7)+x(9−x)=−80
Trả lời: x=
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Toán Lớp 8: Tìm xx biết:x(x+7)+x(9−x)=−80
Trả lời: x=
Comments ( 2 )
x^2+7x+9x-x^2=-80
x^2-x^2+7x+9x=-80
16x=-80
x=-5
Vậy x=-5