Ответ:
1) (2x-1)(15+9x)-6x(3x-5)=87
30x+18x^2-15-9x-18x^2+30x=87
51x=87+15
51x=102
x=2
2) (14x-1)(2+x)=(2x-8)(7x+1)
28x+14x^2-2-x=14x^2+2x-56x-8
28x+14x^2-x-14x^2-2x+56x=2-8
81x=-6
x=81/(-6)
x=-13,5
3) (x+10)(x-5)-(x-6)(x+3)=16
x^2-5x+10x-50-x^2-3x+6x+18=16
8x=16+50-18
8x=48
x=6
4) (3x+7)(8x+1)=(6x-7)(4x-1)+93x
24x^2+3x+56x+7=24x-6x-28x+7+93x
24x^2+3x+56x-24x+6x+28x-93x=7-7
x^2+93x-93x=0
x^2=0
x=0
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Answers & Comments
Ответ:
1) (2x-1)(15+9x)-6x(3x-5)=87
30x+18x^2-15-9x-18x^2+30x=87
51x=87+15
51x=102
x=2
2) (14x-1)(2+x)=(2x-8)(7x+1)
28x+14x^2-2-x=14x^2+2x-56x-8
28x+14x^2-x-14x^2-2x+56x=2-8
81x=-6
x=81/(-6)
x=-13,5
3) (x+10)(x-5)-(x-6)(x+3)=16
x^2-5x+10x-50-x^2-3x+6x+18=16
8x=16+50-18
8x=48
x=6
4) (3x+7)(8x+1)=(6x-7)(4x-1)+93x
24x^2+3x+56x+7=24x-6x-28x+7+93x
24x^2+3x+56x-24x+6x+28x-93x=7-7
x^2+93x-93x=0
x^2=0
x=0