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Камилла885
@Камилла885
December 2021
1
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помогите пожалуйста по алгебре 7 класс
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tttt34
11.
17а+12b-14c-11a+10b+14c=(17a-11a)+(12b+10b)+(-14c+14c)=6a+22b
12.
12a^2-7ab-3a^2+ab-b^2=(12a^2-3a^2)+(-7ab+ab)-b^2=9a^2-6ab-b^2
13.
x^2-x-x^2+2x-9=(x^2-x^2)+(-x+2x)-9=x-9
14.
7x+8-2-6x+6+x+x^2=(7x-6x+x)+(8-2+6)+x^2=2x+12+x^2
15.
12a+11c-8-14a+5c=(12a-14a)+(11c+5c)-8=-2a+16c-8
16.
5a^2-10a+3-3+10a+5a^2=(5a^2+5a^2)+(-10a+10a)+(3-3)=10a^2
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Answers & Comments
17а+12b-14c-11a+10b+14c=(17a-11a)+(12b+10b)+(-14c+14c)=6a+22b
12.
12a^2-7ab-3a^2+ab-b^2=(12a^2-3a^2)+(-7ab+ab)-b^2=9a^2-6ab-b^2
13.
x^2-x-x^2+2x-9=(x^2-x^2)+(-x+2x)-9=x-9
14.
7x+8-2-6x+6+x+x^2=(7x-6x+x)+(8-2+6)+x^2=2x+12+x^2
15.
12a+11c-8-14a+5c=(12a-14a)+(11c+5c)-8=-2a+16c-8
16.
5a^2-10a+3-3+10a+5a^2=(5a^2+5a^2)+(-10a+10a)+(3-3)=10a^2