Question

[chipudangyeu]

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\(2a-\left(5-4a\right)+\left(6a-1\right)-\left(2+a\right)\)

\(5a-2b+3-\left(2a-5b+6\right)+\left(a+3b-1\right)\)

\(6x\left(x-1\right)-1\left(6x^2-8x+3\right)=7-\left(x-1\right)\)

\(7x\left(2x-1\right)-\left(14x^2-8x+5\right)=7-\left(-2x+3\right)\)

Thanks các bạn nhiều nha

Answer 1

[Bạch Trúc]

2a - (5- 4a) +(6a -1) -(2+a)

= -10a - 8a^2 +6a -1 -2 -a

= -8a^2 -5a -3

5a - 2b +3 - (2a -5b +6) +(a+3b -1)

= 5a -2b +3 -2a+5b -6 +a + 3b -1

= 4a +6b -4

6x(x-1) -1(6x^2 -8x +3) = 7 -(x-1)

6x^2 -6x - 6x^2 + 8x -3 = 7 -x +1

3x = 11

x= 11/3

7x(2x-1) - (14x^2 -8x +5) = 7- (-2x +3)

14x^2 - 7x - 14x^2 + 8x - 5 = 7 + 2x -3

-x = 9

x=-9