.......помогите ,,,,,

Question

.......помогите ,,,,,

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Answer 1

1.
-2а²-10b²-7c
-5c-a³-3b^5
2.
x³y+4x^8y²-15x-4x^6y^8
2x+y³+2x^15y
3.
5*2²-4*2+1=13
4.
2x²-6x+8+15-5+x²=3x²-11x+23
2x²-6x+8-15+5-x²=x²-x-7
5.
7x-9+2x-8=1
9x=18
x=2

Comments

спасибо большое