3*1+2*2=7 3+4=7 7=7
1²-3*2=-5 1-6=-5 -5=-5
Является
6-12+8х=5х-9
8х-5х= -9-6+12
3х= -3
х= -3:3
х= -1
360---100%
4-5=100%-12%+37%=51%
А)=2x+y - (2x-y) / x-3 = 2x+y-2x+y / x-3= 2y/x-3
б)=a-2b - (a+2b) / a+2b= a-2b-a-2b / a+2b= -b/a+2b
в)=rd-r³ - (rd-r^5+r³) / d-r^4 = rd-r³-rd+r^5-r³ / d-r^4 = r^5-2r³/d-r^4
г)=t-7u - (t+7u) / tu = t-7u - t-7u / tu=-14u / tu
д)=w²-w+1-w / (w+1)² = w²-2w+1 / (w+1)²= (w-1)²/(w+1)²
е)=f³+g³ - (-3fg(f+g)) / (f+g)³ = f³+g³ - (-3f²g-3fg²) / (f+g)³ = f³+g³+3f²g+3fg² / (f+g)³ = 3f²g+3fg²
ж)=2n-11n-(-7n-3n) / 5n+14n = 2n-11n+7n+3n / 19n= n/19n