Đáp án:
Giải thích các bước giải:
`4(x+1)^2 - (2x-1)^2 - 8(x-1)(2+1) = 11`
`⇔ 4(x+1)^2 - (2x-1)^2 - 24(x-1) = 11`
`⇔ 4x^2 + 8x + 4 - 4x^2 + 4x - 1 - 24x + 24 = 11`
`⇔ (4x^2-4x^2)+(8x+4x-24x) + (4-1+24) = 11`
`⇔ -12x + 27 = 11`
`⇔ -12x = -16`
`⇔ x = 4/3`
Vậy phương trình có nghiệm là : `S = {4/3}`
`4(x+1)^2 - (2x-1)^2 - 8(x-1) (2+1)=11`
`⇔ 4(x+1)^2 - (2x-1)^2 - 8(x-1)3=11`
`⇔ 4(x^2 + 2x + 1) - (4x² -4x + 1) - 24(x - 1) = 11`
`⇔ 4x^2 + 8x + 4 -4x ² + 4x -1 -24x + 24 = 11`
`⇔4x^2 - 4x^2 + 8x + 4x - 24x = 11 - 4 + 1 -24`
`⇔ x = {-16}/{-12}= 4/3`
Vậy tập nghiệm của phương trình là `S={4/3} `
1m khổ 80cm, 3 zem ( tấm mica ) làm được bao nhiêu kính chống giọt. Kích thước dài 17cm .Rộng 22cm
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giải giúp mình với ạ. Càng nhanh càng tốt Cảm ơn trước ạ
Tìm x, y a, $\frac{x}{4}$ = $\frac{y}{3}$ và x.y=48 b, $\frac{x}{3}$ =$\frac{y}{4}$ và x ²+y ²=100
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