Решение смотри в приложении
1) -(a+b+c)+d;
2) -m+n-(k+e);
3) -(2a+3b)+4c+(-5d);
4) -5p+3q+(-10m)
-5x(x-2)+(x-3)(5x+1)= -5x²+10x+5x²+x-15x-3= 10x+x-15x-3= -4x-3.
3a(a-b)-(a+b)(3a-b)= 3a²-3ab-(3a²-ab+3ab-b²)= 3a²-3ab-(3a²+2ab-b²)= 3a²-3ab-3a²-2ab+b²= -3ab-2ab+b² = -5ab+b².
(2a-b)(3a+b)+(3a-5b)(a-b)= 6a²+2ab-3ab-b²+3a²-3ab-5ab+5b²= 9a²-9ab+4b².
(5x²y-y)(x-2y)-(x²+2y)(5x-3y)= 5x³y-10x²y²-xy+2y²-(5x³-3x²y+10xy-6y²)= 5x³y-10x²y²-xy+2y²-5x³+3x²y-10xy+6y²= 5x³y-10x²y²-11xy+8y²<span>-5x³+3x²y.
3a(a+3)+(2-a)(3a-4)= 3a</span>²+9a+6a+8+3a²+4a= 9a+6a-8+4a= 19a-8.
7x²(x-2y)-(x-y)(7x+y)=7x²-14xy-(7x²+xy-7xy-y²)= 7x²-14xy-(7x²-6xy-y²)= 7x²-14xy-7x²+6xy+y²= -14xy+6xy+y²= -8xy+y².
(3m-2n)(2m-3n)+(3n-m)(2n-m)= 6m²-9mn+4mn+6n²+6n²-3mn-2mn+m²= 7m²-18mn+12n².
(2a-5b²)(a+b)-(b²-2a)(a-5b)= 2a²+2ab-5ab²-5b³-(ab²-5b³-2a²+10ab)= <span>2a²+2ab-5ab²-5b³-ab</span>²+5b³+2a²-10ab= 4a²-8ab-6ab².
x=-3+√3²-4*2*-11/2*2 / 2*2
x=-3-√3²-4*2*-11/2*2 / 2*2
1) =5x^2 y^4 z^6 * (-8x^6 z^3 y^9)= - 40 x^8 y^13 z^9
2) = 8a^3 b^6 c^9 : 9a^2 c^4 b^2 = 8/9 * a^5 b^8 c^13