[(2x-x ^ 2) (x ^ 2 + 4x + 3)] / [(x ^ 2 + x) (x ^ 2-5x + 6)], where x = 2

[(2x-x ^ 2) (x ^ 2 + 4x + 3)] / [(x ^ 2 + x) (x ^ 2-5x + 6)], where x = 2

[(2x-x^2)(x^2+4x+3)]/[(x^2+x)(x^2-5x+6)]
=-x(x-2)/(x+3)(x+1)/x(x+2)(x-3)(x-2)
=-(x+3)(x+1)/(x+2)(x-3)
When x = 2
Original formula = - 5 × 3 / (- 4)
=15/4

X (x squared - 1) + 2x squared (x + 1) - 3x (2x-5) do me a favor

x(x²-1)+2x²(x+1)-3x(2x-5)
=x³-x+2x³+2x²-6x²+15x
=3x³-4x²+14x

How to solve 3x + 4 * (2x-1) + 2 * (44-3x) = 141

It's better to teach people how to fish than to teach them how to fish. The key to solving such problems is to have ideas. You can't just give answers to the people above. You will still encounter problems in the future
3x+4*(2x-1)+2*(44-3x)=141
3X+8X-4+88-6X=141
5X=57
X=11.4
Please respect each other and adopt the answer in time!

Binary linear equations: 4 (2x + y) - 5 (2x - y) = 3 2 (2x + y) + 10 (2x - y) = 39 help me
That is = 3, not = 324 (2x + y) - 5 (2x-y) = 32 (2x + y) + 10 (2x-y) = 39

4（2x+y)-5(2x-y)=3.①
2（2x＋y）＋10（2x－y）＝39.②
①*2:8（2x+y)-10(2x-y)=6.③
②+③：10（2x+y)=45
（2x+y)=4.5
Similarly: (2x-y) = 3
Simultaneous: x = 15 / 8, y = 3 / 4
Or take 2x + y and 2x - y as a whole, let 2x + y = a, 2x - y = B,
The equation is abbreviated as 4a-5b = 3, 2A + 10B = 39,
The solution is a = 9 / 2, B = 3,
Then x = 15 / 8, B = 3 / 4