Toán Lớp 8: Bài 1 Rút gọn biểu thức
a) x(2×2 – 3) – x2(5x + 1) + x2 b) 3x (x – 2) – 5x(1 – x) – 8(x2 – 3)
Bài 2 Tìm x, biết
a) (3×2 – x + 1)(x – 1) + x2(4 – 3x) = 5/2
b) 2×2 + 3(x – 1)(x + 1) = 5x(x + 1)
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Toán Lớp 8: Bài 1 Rút gọn biểu thức
a) x(2×2 – 3) – x2(5x + 1) + x2 b) 3x (x – 2) – 5x(1 – x) – 8(x2 – 3)
Bài 2 Tìm x, biết
a) (3×2 – x + 1)(x – 1) + x2(4 – 3x) = 5/2
b) 2×2 + 3(x – 1)(x + 1) = 5x(x + 1)
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