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2 năm trước
Bài 1: a) {2x-3(x-1)-5[x-4(3-2x)+10]} * -2x Bài 2:Chứng tỏ rằng giá trị của mỗi biểu thức sau không phụ thuộc vào giá trị của biến a) 2(2x+x2) - x2(x+2) + (x3-4x+3) b) z(y-x) + y(z-x) + x(y-z) – zyz +100 c) 2y(y2+y+1)-2y2(y+1)-2(y+10)
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