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Назмина130
@Назмина130
July 2022
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помогите срочно алгебра 7 класс
За ранее спасибо
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slomanierebrap48reu
1. Е
2.a) s=6 (4x-5)^2; b) v=(4x-5)^3
3. a) 87^2-2*87*67+67^2=(87-67)^2 = 20^2=400
b) (38-17)(38+17)/(47-19)(47+19) = 21*55/28*66=3*5/4*6=5/4*2=5/8
4. x-y=34
x^2-y^2=408
x=34+y; 34^2+68y=408; |:34; 34+2y=12; 2ý=-22; y=-11, x=34+11=45
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Answers & Comments
2.a) s=6 (4x-5)^2; b) v=(4x-5)^3
3. a) 87^2-2*87*67+67^2=(87-67)^2 = 20^2=400
b) (38-17)(38+17)/(47-19)(47+19) = 21*55/28*66=3*5/4*6=5/4*2=5/8
4. x-y=34
x^2-y^2=408
x=34+y; 34^2+68y=408; |:34; 34+2y=12; 2ý=-22; y=-11, x=34+11=45