1)4а·(-3ab)=-12a²b
2) -2m²·0,1m⁴n·(-5n³)=(-2·0,1·(-5))·m⁶n⁴=m⁶n⁴
X(x+6)<18
1/27(x+3)^2<1
3(-1-3^1/2)<x<3((3^1/2)-1)
(3(-1-3^1/2), 3((3^1/2)-1))
Из равенства а+2*b=4 находим a=4-2b, тогда:
а=(4-2b)=64-96*b+48*b-8*b,
a+8*b=64-96*b+48*b,
64-24*a*b=64-24*b*(4-2*b)=64-96*b+48*b
Равенство доказано.
1) a + 2b = 4;
(a + 2b) = 4;
a + 4ab + 4b = 16;
2) a + (2b) = 64 — 24ab;
(a + 2b)*(a — 2ab + 4b) = 64 — 24ab;
4(a — 2ab + 4b) = 64 — 24ab;
a — 2ab + 4b = 16 — 6ab;
a + 4ab + 4b = 16;
16 = 16
-3х × 5у × ( -8z ) = -15xy × ( -8z ) = 120xyz.
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Удачи)))))
1. -5*(х+3)-(-2х+16)=7
2. -5х-15+2х-16-7=0
3. -3х-38=0
4. -3х=38⇒х=38/3, т. е. х=12, 2/3