4x^2-9xy+2y^2=-4 ,且y/4<x<2y,则3x+y的最小值

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摘要原式=- x^3 × x^10 + x^8 × x^6 = - x^13 + x^14 = x^14 - x^13

原式= x^3m × x^3m - 2 × x^6m = x^6m - 2x^6m = - x^6m

原式= 9a^2b^4 + 4a^2b^4 = 13a^2b^4

原式= a^3n × b^9 × a^2 × b^2(2n-7) - a^(2n+2) × a^n × b^2n = a^(3n+2) × b^(2n+2) - a^(3n+2) × b^2n

原式= 3x^3y^3 × (4/9) × x^4y^2 - (1/27) × x^6y^3 × 9xy^2 = (4/3) × x^7y^5 - (1/27) × x^7y^5 = (35/27) × x^7 × y^5 = (35/27) × (-1)^7 × 2^5 = -1120/27

原式= (-4/3) × x^2y^2 × (-3/4)x^2 + (-4/3) × x^2y^2 × xy - (-4/3) × x^2y^2 × (2/5)y^2) = x^4y^2 - (4/3) × x^3y^3 + (8/15) × x^2y^4

原式＝(1/2) × x^3 × (-6x) -(1/2) × 2x^2 × (-6x) +(1/2) × (2/3) × (-6x) = -3x^4 + 6x^3 - 2x

原式= 4x^4y^28 - 4x^2y^30 + 4x^2y^4

咨询记录 · 回答于2024-01-12

4x^2-9xy+2y^2=-4 ,且y/4

需要过程哦

原式=- x^3 × x^10 + x^8 × x^6 = - x^13 + x^14 = x^14 - x^13 原式= x^3m × x^3m - 2 × x^6m = x^6m - 2x^6m = -x^6m 原式= 9a^2b^4 + 4a^2b^4 = 13a^2b^4 原式= a^3n × b^9 × a^2 × b^2(2n-7) - a^(2n+2) × a^n × b^2n = a^(3n+2) × b^(2n+2) - a^(3n+2) × b^2n 原式= 3x^3y^3 × (4/9) × x^4y^2 - (1/27) × x^6y^3 × 9xy^2 = (4/3) × x^7y^5 - (1/27) × x^7y^5 = (35/27) × x^7 × y^5 = (35/27) × (-1)^7 × 2^5 = -1120/27 原式= (-4/3) × x^2y^2 × (-3/4) × x^2 + (-4/3) × x^2y^2 × xy - (-4/3) × x^2y^2 × (2/5)y^2 = x^4y^2 - (4/3) × x^3y^3 + (8/15) × x^2y^4 原式＝(1/2) × x^3 × (-6x) - (1/2) × 2x^2 × (-6x) + (1/2) × (2/3) × (-6x) = -3x^4 + 6x^3 - 2x 原式= 4x^4y^28 - 4x^2y^30 + 4x^2y^4

完全不是我问的那道题

在吗

能解一下我那到题吗

亲，您好！为您解析：（1）-4x2y+9xy2-9x2y-21xy2（2）（2xy-y）-（-y+xy）（3）4（x2+xy-5）-3（2x2-xy）（4）3x2-[7x-3（4x-3）-2x2]

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