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March 2022
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erzhan9210
1.а) (5x³-3x²+7)+(3x³+6x-7)=8x³-3x²+6x
б) (5x³-3x²+7)-(3x³+6x-7)=5x³-3x²+7-3x³-6x+7=2x³-3x²-6x+14
2.a)
b)
3.
4. (a-2)(a+7)-(a+4)(a-3)=a²-2a+7a-14-a²-4a+3a+12=4a-2=4(-3/4)-2=-3-2=-5
5. a=x
b=x-2
a1=x+1
b1=x-2+2=x
x(x+1)-x(x-2)=19
x²+x-x²+2x=19
3x=19
x=19:3=6 1/3
2 votes
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AlinaElderhanova2004
Спасибо
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Answers & Comments
б) (5x³-3x²+7)-(3x³+6x-7)=5x³-3x²+7-3x³-6x+7=2x³-3x²-6x+14
2.a)
b)
3.
4. (a-2)(a+7)-(a+4)(a-3)=a²-2a+7a-14-a²-4a+3a+12=4a-2=4(-3/4)-2=-3-2=-5
5. a=x
b=x-2
a1=x+1
b1=x-2+2=x
x(x+1)-x(x-2)=19
x²+x-x²+2x=19
3x=19
x=19:3=6 1/3