(0,9a^6b)(-0,5a^2b)
вот так
=(5z²)²-(b³)² = (5z²-b³)(5z²-b³)
3m + (1 + 2m) = 5m + 1
3m - (1 + 2m) = m - 1
3m - (1 - 2m) = 5m - 1
3m + (1 + (2 + m)) = 4m + 3
3m + (1 + (2 - m)) = 2m + 3
<span>3m + (1 - (2 + m)) = 2m - 1</span>
Х²+(3х/2)=х+7/4|×4
4х²+6х=4х+7
4х²+6х-4х-7=0
4х²+2х-7=0
D=(-2)²-4×4×(-7)=4+112=116
x1=(-2-√116)/2×4=(-2-10,77)/8=-12,77/8=-1,5963
x2=(-2+√116)/2×4=(-2+10,77)/8=8,77/8=1,0963
Решение
1) cos720+tg 30 ctg 210+sin 120 = сos2*360° + tg30°ctg(180° + 30°) +
+ sin(90° + 30)° = 1 + 1/√3*ctg30° + sin30° = 1 + (1/√3)*(√3) + 1/2 = 1 + 1 + 1/2 = 2(1/2)
<span>tg0 </span>°<span>- 2ctg90</span>° <span>- sin0</span>° <span>- 3cos90</span>° = 0 - 2*0 - 0 - 3*0 = 0