36y²−7y+m=(6y-x)²
2*6*x=7 ⇒ x=7/12
m=x²=49/144
36y²−7y+49/144=(6y-7/12)
(a-0.3 )² - ( 7 + 4/3a) ( 7 - 4/3a ) = a²- 0.6a + 0.09 - 49 + 16/9a² = 2 7/9 a² - 0.6a -48.91
Cos(270-48)+sin48+2*1=-sin48+sin48+2=2
Объяснение:
1) 2(х-7)+5х(-9)+25 =2х-14-45х+25=11-43х
2)-0.5(2х-4)-8(3х-4)-13=-х+2-24х+32-13=
=21-25х
3)19х+8(9-4х)=19х+72-36х=72-17х
(1,2•(-1)-0,4•(-1))^3=(-1,2+0,4)^3=-0,8^3=-0,512