1) 32*5=160 2) 6:3=2 3) 160+2=162
D=49+120=169
x1=(-7-13)/12=-20/12=-5/3
x2=(-7+13)/12=1/2
6x²+7x-5=3(x+5/3)*2(x-1/2)=(3x+5)(2x-1)
3,5,7,9,11,13,15,17,19,21,23,25
1. ab+(a-b)(a²+ab+b²)/(a-b)=ab+a²+ab+b²=a²+2ab+b²=(a+b)²
2.(4ab(a+b)/ab+(a+b)(a-b)/(b-a))²=(4(a+b)-(a+b))²=(3(a+b))²=9(a+b)²
3.(a+b)²÷<span>9(a+b)²=1/9</span>
(99^3-61^3)/38 + 99 * 61 = (99^3-61^3)/38 + 6039 = 25600