Question

срочно помогите,даю 30 балов
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Answer 1

Объяснение:

1)

(3x²-y)*(2x-5y²)=6x³-15x²y²-2xy+5y³

(2x²-y)*(3x-5y²)=6x³-9x²y²-2xy+3y³

2)

(3a-7b)*(2a+3b)+5ab=6a²+9ab-14ab-21b²+5ab=6a²-21b²

(2a-6b)*(3a+5b)+8ab=6a²+10ab-18ab-30b2+8ab=6a²-30b²

3)

y²*(y²-2y+3)*(y+2)=(2y⁴-3y³+3y³)*(-2)=2y-2

y²*(y²+2y-3)*(y-2)=(2y⁴+3y³+2)*(2)=5y⁷+4

4)

(2-6x)*(7+8x)+(24x+1)*(2x+1)=14+16x-42x-48x²+48x²+24x+2x+1=15