(X*3.2)+(X*1.7)+(X*1.8)+(X*2.3)+X=25.2
Tìm x
( x + 3.2 ) + ( x + 1.7 ) + ( x+ 1.8 ) + ( x + 2.3 ) + x =25.2
\(\Rightarrow\left(x+x+x+x\right)+\left(3,2+1,8+1,7+2,3\right)=25,2\)
\(\Rightarrow4x+9=25,2\)
\(\Rightarrow4x=16,2\Rightarrow x=4,05\)
tính nhanh
1.7 x 2.3 + 1.7 x 3.7 + 3 x 17 + 0.17 : 0.01
=1.7 * ( 2.3 + 3.7 + 3 : 0.01 )
=1.7 * 0,1
=0.17
| X-1.7| =2.3
|x-1,7|=2,3 xét 2 trường hợp
* th1:
\(\left|x-1.7\right|\ge0\)
\(\Rightarrow\left|x-1.7\right|=x-1.7\)
\(\Rightarrow x-1.7=2.3\Rightarrow x=2.3+1.7=4\)
th2:
\(\left|x-1.7\right|< 0\)
\(\Rightarrow\left|x-1.7\right|=1.7-x\)
\(\Rightarrow1.7-x=2.3\Rightarrow x=-0.6\)
vậy x = 4 hoặc x = -0.6
\(\left|x-1.7\right|=2.3\)
TH1 : \(x-1.7=2.3\)
\(x=2.3+1.7\)
\(x=4\)
TH2 :
\(x-1.7=-2.3\)
\(x=-2.3+1.7\)
\(x=-0.6\)
\(|x-1,7|=2,3\)
\(\Rightarrow\orbr{\begin{cases}x-1,7=2,3\\x-1,7=-2,3\end{cases}}\Rightarrow\orbr{\begin{cases}x=4\\x=-0,6\end{cases}}\)
Vậy x = 4 hoặc x = -0,6
_Chúc bạn học tốt_
a) |x-1.7|=2.3
b) |x+3/4|-5=-2
a)|x-1,7|=2,3=>xét 2 th
TH1:x-1,7=2,3=>x=4
TH2:x-1,7=-2,3=>x=-0,6
Vậy x thuộc tập giá trị (-0,6;4)
b)|x+3/4|-5=-2=>|x+3/4|=3
tương tự như câu a,ta xét 2 th ra x thuộc tập giá trị (2,25;-3.75)
a, |x-1,7|=2,3
(-) \(\hept{\begin{cases}x-1,7=2,3\\1,7-x=2,3\end{cases}}\)
(-) \(\hept{\begin{cases}x=2,3+1,7\\x=1,7-2,3\end{cases}}\)
(-) \(\hept{\begin{cases}x=4\\x=-0,6\end{cases}}\)
6x+2+6x=1332
2.3x+1-3x=135
3x(3.2-1)=5
2.3x+1-3x=135
2.3x=18
2x+3.2x+4.2x=32
trả lời đúng cho 1 like
2.3x=18
3x=9
3x=32
x=2
2x+3.2x+4.2x=32
2x(3+4+1)=32
2x=4
2x=22
x=2
Tìm x:a. \(3^{x+1}\)+\(2.3^{x-1}\) = 99
b. \(3.2^{x+2}+3.2^x=120\)
3x+1+2.3x-1=99
=>3x-1(32+2)=99
=>3x-1.11=99
=>3x-1=99:11=9=32
=.x-1=2
=>x=3
Vậy x=3
b,3.2x+2+3.2x=120
=>3.2x(22+1)=120
=>3.2x.5=120
=>3.2x=120:5
=>2x=24:3=8=23
=>x=3
Vậy x=3
=
Tìm x
a) 197 -9 ( x+3) =80
b) 7 (x- 14) + 35 = 56
c) 2.3x+1 =54
d) 3.2x-1 =24
a)197-9(x+3)=80
=>9(x+3)=197-80
=>9(x+3)=117
=>x+3=117:9
=>x+3=13
=>x=13-3=10
b)7(x-14)+35=56
=>7(x+14)=56-35
=>7(x+14)=21
=>x+14=21/7
=>x+14=3
=>x=3-14=(-11)
c)2.3x-1=54
=>3x-1=54:2
=>3x-1=27
=>3x-1=33
=>x-1=3
=>x=3+1=4
d)3.2x-1=24
=>2x-1=24:3
=>2x-1=8
=>2x-1=23
=>x-1=3
=>x=3+1=4
\(a,197-9\left(x+3\right)=80\)
\(197-\left(9x+27\right)=80\)
\(197-9x-27=80\)
\(197-9x=107\)
\(9x=90\)
\(x=10\)
\(b,7\left(x-141\right)+35=56\)
\(7x-987+35=56\)
\(7x=56-35+987\)
\(7x=1008\)
\(x=144\)
197 - 9 . ( x + 3 ) = 80
9 . ( x + 3 ) = 197 - 80
9 . ( x + 3 ) = 117
x + 3 = 117 : 9
x + 3 = 13
x = 13 - 3
x = 10
7 . ( x - 14 ) + 35 = 56
7 . ( x - 14 ) = 56 - 35
7 . ( x - 14 ) = 21
x - 14 = 21 : 7
x - 14 = 3
x = 3 + 14
x = 17
Tìm x thuộc N, biết:
a) 2.3x = 18
b) 2x + 3.2x + 4.2x = 32
c) 3x + 4x = 5x
a, 2.3x = 18
=> 3x = 9 = 32
=> x = 2
b, 2x + 3.2x + 4.2x = 32
=> 2x.(1+3+4) = 32
=> 2x . 8 = 32
=> 2x = 4 = 22
=> x = 2
c, 3x + 4x = 5x
Câu này mik chưa nghĩ ra
a)1.3^x=18
=>3^x=18:2=9
=>3^x=3^2
=>x=2
b)=>2^x.(1+3+4)=32
=>2^x.8=32
=>2^x=4
=>2^x=2^2
=>x=2