Toán Lớp 8: Bài 1: Tìm x:
a) 7x^2(x^2-7)+5x(7-x^2)=0
b) (2x+5)^2-2(2x+5)(x-1)+(x-1)^2=49
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Toán Lớp 8: Bài 1: Tìm x:
a) 7x^2(x^2-7)+5x(7-x^2)=0
b) (2x+5)^2-2(2x+5)(x-1)+(x-1)^2=49
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