4x+1>x-2,6(2/3x-1)>x-3

娃哈哈b2082022-10-04 11:39:541条回答

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小鱼爱小小猪 共回答了13个问题 | 采纳率100%
(1)
4x+1>x-2
3x>-3
x>-1
解集为:{x|x>-1}
(2)
6(2/3 x-1)>x-3
4x-6>x-3
3x>3
x>1
解集为:{x|x>1}
1年前

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(3x^2-4x+1)(3x^2+4x+1)= 2(3-5a)^2-5(3a-7)(3a+7)=
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(3x^2-4x+1)(3x^2+4x+1)
=[(3x^2+1)-4x][(3x^2+1)+4x]
=(3x^2+1)^2-16x^2
=9x^4+6x^2+1-16x^2
=9x^4-10x^2+1
2(3-5a)^2-5(3a-7)(3a+7)
=2(5a-3)^2-5(3a-7)(3a+7)
=50a^2-60a+18-5(9a^2-49)
=50a^2-60a+18-45a^2+245
=50a^2-45a^2-60a+18+245
=5a^2-60a+263