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Dashka15469
@Dashka15469
July 2022
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Помогите пожалуйста) решите уравнение: 9х^2-7(х+4)(4-х)-(1-4х)^2=15
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Sakonaaai
9х^2+(-7x-28)(4-x)-(1-8x+16x^2)=15
9x^2-28+7x^2-112+28x-1+8x-16x^2=15
0-113+8x=15
8x=15+113
8x=128
x=16
3 votes
Thanks 2
Dashka15469
Спасибо огромное, очень выручила)))
lidochka085
9х²-7(х+4)(4-х)-(1-4х)²
=15
9х²-7(4²-х²)-(1-8x+16х²)=15
9х²-112+7х²-1+8x-16х²-15=0
8x-128=0
8x=128
x=128/8
x=16
1 votes
Thanks 0
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Answers & Comments
9x^2-28+7x^2-112+28x-1+8x-16x^2=15
0-113+8x=15
8x=15+113
8x=128
x=16
9х²-7(4²-х²)-(1-8x+16х²)=15
9х²-112+7х²-1+8x-16х²-15=0
8x-128=0
8x=128
x=128/8
x=16