I вариант:
1. 3a²-5a = 3*(-3)²-5*(-3) = 3*9+15= 37+15 = 42
2. a) -5x+3x²-9x+15x² = 18x²-14x
b) 3a²a-5a*3b-12bbb = 3a³-15ab-12b³
3. a) (2a-6b)+(-3a+2b) = 2a-6b-3a+2b = -a-4b
b) (-2x²-3a+4)-(-2x²+7x-6) = -2x²-3x+4+2x²-7x+6 = -10x+10
4. a) -2a²b(1,2ab²+0,4a³b) = -2,4a³b³-0,8a^5b²
b) 7a(a-b)-b(b-7a) = 7a²-7ab-b²+7ab = 7a²-b²
5. a) 5-2(x-1)+3(x-2)=0
5-2x+2+3x-6 = 0
x+1 = 0
x = -1
b) 3x-5(2x-1) = 12
3x-10x+5 = 12
-7x = 12-5
-7x = 7
x = -1
6. 6xy-2x²-(3xy+4x²+1)-(-xy-2x²-1) = 6xy-2x²-3xy-4x²-1+xy+2x²+1 = -4x²-2xy
II вариант:
1. 5a²-3a = 5*(-3)²-3*(-3) = 5*9+9 = 45+9 = 54
2. a) -4y+7y²-5y+3y² = 10y²-9y
b) -4x³x-2x*3y+15yy = -4x^4-6xy+15y²
3. a) (7a-9b)+(-3b+2a) = 7a-9b-3b+2a = 9a-12b
b) (-3x²-5x+1)-(-3x²+2x-9) = -3x²-5x+1+3x²-2x+9 = -7x+10
4. a) -3a²b²(0,8a+0,3b) = -2,4a³b²-0,9a²b³
b) 3x(x-2a)-6a(a-x) = 3x²-6ax-6a²+6ax = 3x²-6a²
5. a) 7+4(x-2)-3(x-1) = 0
7+4x-8-3x+3 = 0
x+2 = 0
x = -2
b) 2x-7(3x-1) = 26
2x-21x+7 = 26
-19x = 26-7
-19x = 19
x = -1
6. -(2ab²-ab+b)+3ab²-4b-(5ab-ab²) = -2ab²+ab-b+3ab²-4b-5ab+ab² = 2ab²-4ab-5b