Question

1.Efectuand calculele 9a-4a+8a-14a,rezultatul este.....
2.Calculand 3(-2+b-3c)-2(-a-3b-c)-(3a-4b-2c),rezultatul este.......
3.Reducand termeni asemenea din 2(4x la a doua-6x+5)-3(2x la a doua-5x+4)-2(x la a doua-4x-2),se va obtine......
4.Efectuand calculele (2x+5)(2x-3)-(x-2)(x-3)-(3x-2)(2x+5),rezultatul obtinut este egal cu .......

Answer 1

1) 9a-4a+8a-14a= - a

2) 3(-2+b-3c)-2(-a-3b-c)-(3a-4b-2c)=
-6+2b-9c+2a+6b+2c-3a+4b+2c=
-6+12b-5c-a=
12b-5c-a-6

3) 2(4x²-6x+5)-3(2x²-5x+4)-2(x²-4x-2)=
8x²-12x+10-6x²+15x-12-2x²+8x+4=
11x+2

4) (2x+5)(2x-3)-(x-2)(x-3)-(3x-2)(2x+5)=
4x²-6x+10x-15-(x²-3x-2x+6)-(6x²+15x-4x-10)=
4x²-6x+10x-15-x²+3x+2x-6-6x²-15x+4x+10=
-3x²-2x-11

Answer 2

1. 5a+8a-14a=13a-14a= -a
2.-6+3b-6c+2a+6b+2c-3a+4b+2c= -a+13b-2c-6
3.16x la a doua - 12x+10-6x la a doua - 15x-12- 2x la a doua +8x+4=8x la a doua-37x+12
4. 4x la a doua - 6x+10x-15-(x la a doua - 3x-2x+6)-(6x la a doua+15x-4x-10)= 4x la a doua-6x+10x-15-x la a doua+3x+2x-6-6x la a doua-15x+4x+10= -3x la a doua-2x-11