62x + 3.2x = 9.29
\(sin^62x+cos^62x=0\)
sin6(2x)+cos6(2x)=0
<=>(sin22x)3+(cos22s)3=0
<=> (sin22x+cos2x)[(sin42x-2sin22x.cos22x+cos42x)=0
<=>sin42x-2sin22x.cos22x+cos42x=0
đến đây bạn nhóm l;ại và giải
KQ là k có nghiệm
=> PT vô nghiệm
1. Tính:
a) -5,94-13,78
b) 3/4-5/4: -10/16
c) 12,17. 5/9-5/9.29/17+ 1 và 5/9
a/\(-5,94-13,78=-19,72\)
b/\(\dfrac{3}{4}-\dfrac{5}{4}:\dfrac{-10}{16}\)
\(=\dfrac{3}{4}+\dfrac{5}{4}\cdot\dfrac{8}{5}\)
\(=\dfrac{3}{4}+\dfrac{8}{4}\)
\(=\dfrac{11}{4}\)
c/\(\dfrac{12}{17}\cdot\dfrac{5}{9}-\dfrac{5}{9}\cdot\dfrac{29}{17}+1\dfrac{5}{9}\)
\(=\left(\dfrac{12}{17}-\dfrac{29}{17}\right)\dfrac{5}{9}+1\dfrac{5}{9}\)
\(=-1\cdot\dfrac{5}{9}+1\dfrac{5}{9}\)
\(=\dfrac{-5}{9}+1\dfrac{5}{9}\)
\(=1\)
#DatNe |
4.2x+3.2x+1=80
4.2\(^x\)+3.2\(^{x+1}\)=80
4.2\(^x\)+3.2\(^x\).2\(^1\)=80
2\(^x\).(4+3.2)=80
2\(^x\).10=80
2\(^x\)=8
⇒x=3 vì 2\(^3\)=8
= 22 .2X+3.2X.21=80
=4.2X+3.2.2X
= 4.2X+6.2x
=2X.(4+6)
= 2X.10=80
2X=80:10
2X= 8
X= 8:2
X=4
2x – 3 – 3.2x = – 92.
\(2x-3-3\cdot2x=-92\\\Rightarrow2x-3-6x=-92\\\Rightarrow2x-6x=-92+3\\\Rightarrow-4x=-89\\\Rightarrow x=-89:(-4)\\\Rightarrow x=\dfrac{89}{4}\)
2x – 3 – 3.2x = – 92.
2x-3-6x =-92
2x-6x =(-92)-3
2x-6x =-89
-4x =-89
x =(-89):(-4)
x =22.25
vậy x=22.25
2x – 3 – 3.2x = – 92.
2\(^{x-3}\) -3.2\(^x\) = -92
2\(^{x-3}\).(1 - 3.23) = (-92)
2\(^{x-3}\).(-23) = (-92)
2\(^{x-3}\) = (-92) : (-23)
2\(^{x-3}\) = 4
2\(^{x-3}\) = 22
\(x-3\) = 2
\(x\) = 2 + 3
\(x\) = 5
5) tính ....a)2/3xy^2.2/3xy b)-1/2x^2y.2xy^2 c)8xy^3.2x^3y^2 d)-1/4x^2y^3.2x^3y^2 e)4x^2y^4.1/2x^2y^3 f)-8xy.1/4x^2y
\(a,\dfrac{2}{3}xy^2.\dfrac{2}{3}xy=\dfrac{4}{9}x^2y^3\)
\(b,-\dfrac{1}{2}x^2y.2xy^2=-x^3y^3\)
\(c,8xy^3.2x^3y^2=16x^4y^5\)
\(d,-\dfrac{1}{4}x^2y^3.2x^3y^2=-\dfrac{1}{2}x^5y^5\)
\(e,4x^2y^4.\dfrac{1}{2}x^2y^3=2x^4y^7\)
\(f,-8xy.\dfrac{1}{4}x^2y=-2x^3y^2\)
\(Ayumu\)
Tính 4 x - 3 . 2 x + 2 > 0
Vậy bất phương trình có tập nghiệm S = (-∞; 0) ∪ (1; +∞)
Tính 4 x - 3 . 2 x + 2 > 0
Vậy bất phương trình có tập nghiệm S = (-∞; 0) ∪ (1; +∞)
d) 3.2x+2 − 9.2x = 96
\(d,3.2^{x+2}-9.2^x=96\\ 3.2^2.2^x-9.2^x=96\\ 12.2^x-2^x.9\\ 2^x.\left(12-9\right)=96\\ 2^x.3=96\\ 2^x=96:3\\ 2^x=32\\ 2^x=2^5\\ x=5\)