Объяснение:
7(5а + 8) - 11а= 35a+56 -11a= 24a +56
3(8а - 4) + 6а=24a - 12 +6a= 30a-12
9x + 3(15 - 8x)= 9x +45 - 24x = 45 -15x
11c + 5(8 - c)= 11c + 40 -5c =6c +40
13а - 8(7а - 1)= 13 a - 56a +8=8 -43a
7b - 2(3b - 1)= 7b - 6b +2 = b +2
8 – 6(2х-5) + (12х - 2)= 8- 12x +30 +12x -2=36
2(0,3b - 1) - (3b - 5)=0,6b - 2 - 3b +5= 3- 2,4b
3(0,9а - 1,5) - (За – 9)= 2,7 a -4,5- 3a+9 = 4,5 -0,3a
- (12y - 30у - 4)) +9y= -12y +30y +4 +9y=27y+4
-(4y - 9(2y - 1)) - 14y= -4y +18y -9 -14y = -9
a - (a - (2а - 4 ))= a - ( a -2a +4)= a-a+2a-4=2a -4
b - (b - (3b - 5))= b - (b-3b +5)= b - b +3b -5= 3b -5
7х-((у - x) +3y)= 7x - y +x +3y= 8x +2y
8а - (a - b) + b)= 8a -a +b +b= 7a+2b
2,8 5а -4(5 - а)= 2,85 a -20 +4a =6,85a -20
-3.5a -4 - 3(4 - а)= -3,5 a -4 -12 +3a=-0,5a- 16
-8a (-1,2- а) - (а - 2)= 9,6a +8a^2 -a+2= 8,6a +8a^2 +2
2.=3x^4-12x^2+18x
3.=28a^2b+24ab^2+2a^2b-16ab^2=30a^2+8ab^2
2).=12m+20m^2-60m-20m^2=-48m
m=-0.2
-48*(-0.2)=9.6
3).1.=5a(a-4b)
2.=7x^3(1-2x^2)
3.=2ab(3ab-4a+6b)
4).1.x^2-3x=0
x(x-3)=0
x=0 или x-3=0
x=3
2.(x-2)(x+5)=0
x-2=0 или x+5=0
x=2 x=-5
3).(18xy+6x)+(-24y-8)=6x(3y+1)-8(3y+1)=(3y+1)(6x-8)
(3*0,45+1)(6*5/3-8)=2,35*2=4,7
4).1.=3(a-b)+x(a-b)=(a-b)(3+x)
2.=(a+b)^2+(3a+3b)=(a+b)^2+3(a+b)=(a+b)(a+b+3)
3.=(x^8-4X^5)+(X^3-4)=X^5(X^3-4)+(X^3-4)=(x^3-4)(x^5+1)