x-2=80-x
Tìm :
\(g\left(x\right)=1969-80\text{x}+80\text{x}^2-80\text{x}^3+...+80\text{x}^{1968}-x^{1969}\)
với x = 79
Tìm x:
a.156 -2 * x = 80
b.315 + 5 *x =200
c.5 * (x + 3) -20 =40
d.180 : 80 (x +2 )=60
a) 156 - 2 . x = 80
2 . x = 156 - 80
2 . x = 76
x= 76 : 2
x = 38
b) 315 + 5 . x = 200
5 . x = 200 - 315
5 . x = -115
x= -115 : 5
x = -23
c) 5 . ( x + 3 ) - 20 = 40
5 . ( x +3) = 40+20
5. ( x + 3) =60
x +3 =60:5
x + 3= 12
x = 12 - 3
x =9
Tìm x biết:
a) x + 30% x+1,5 x = 2,5
b) 2 (3x - 4) - 3 (x + 2) = 3
c) -110 + 7x - 80 = 25 + 2x - 80
a, \(x+30\%x+1,5x=2,5\\ < =>x+0,3x+1,5x=2,5\\ < =>\left(1+0,3+1,5\right)x=2,5\\ < =>2,5x=2,5\\ =>x=\dfrac{2,5}{2,5}=1\)
b, \(2\left(3x-4\right)-3\left(x+2\right)=3\\ < =>6x-8-3x-6=3\\ < =>6x-3x=3+8+6\\ < =>3x=17\\ =>x=\dfrac{17}{3}\)
c, \(-110+7x-80=25+2x-80\\ < =>-110-80+80-25=2x-7x\\ < =>-135=-5x\\ =>x=\dfrac{-135}{-5}=27\)
2^x+1+2^x+2-2^x=80
x1+x2+x3+...............+x80+x81=0
x1+x2=x3+x4=............=x77+x78=x78+x79=x79+x80=x80+x81+x1=1
Tính: a81,a80,a79,a78,a1,a2
Tìm x:
2^x + 2^x+2 = 80
2^x + 2^x+2 = 80
2^4 + 2^4+2 = 80
x = 4 nha bạn .
\(2^x+2^{x+2}=80\)
\(2^{x.\left(1+2^2\right)}=80\)
\(2^{x.5}=80\)
\(2^x=10\)
\(2^x=2^4\Rightarrow x=4\)
3^x+1.3^x=27
2^x+2+2^x=80
Bài làm
3x + 1.3x = 27
3x + 3x = 27
2.3x = 27
3x = 27 : 2
3x = \(\frac{27}{2}\)
x = \(\frac{27}{2}:3\)
x = \(\frac{27}{2}.\frac{1}{3}\)
x = \(\frac{9}{2}\)
Vậy x = \(\frac{9}{2}\)
# Học tốt #
Bài làm
~ Mik làm nhầm rồi nha, đừng ai k đúng ~
# Học tốt #
\(3^x+1\cdot3^x=27\)
\(\Rightarrow2\cdot3^x=27\)
\(\Rightarrow3^x=27:2=13,5\)
\(\Rightarrow x=2,8\)
kiểm tra lại đề xem
10 x X + 80-5 x X x 2 = 40 x 2 các bạn nhanh nhé
4*2 mũ x + 2 mũ x = 80 tìm x
\(4.2^x+2^x=80\)
\(2^x.\left(4+1\right)=80\)
\(2^x.5=80\)
\(2^x=16\)
\(2^x=2^4\)
\(\Rightarrow x=4\)