Toán Lớp 8: Câu 1: Thực hiện phép tính:
a)(2x + 3)2+ (2x – 3)2 – (2x + 3)(4x – 6) + xy
b) (4×2 + 4x + 1) : (2x + 1)
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Toán Lớp 8: Câu 1: Thực hiện phép tính:
a)(2x + 3)2+ (2x – 3)2 – (2x + 3)(4x – 6) + xy
b) (4×2 + 4x + 1) : (2x + 1)
Comments ( 2 )
= (4x^2 +12x + 9) + (4x^2 -12x +9) – 2.(4x^2 – 9) + xy
= 8x^2 + 18 – 8x^2 + 18
= 36
b) (4×2 + 4x + 1) : (2x + 1)
= (2x+1)^2 : (2x+1)
= 2x+1