Tìm x, biết:
1) 707 - 3 . ( x + 34 ) = 407
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a/ 12x - 33 = 32 . 32
=> 12x - 33 = 35 = 243
=> 12x = 243 + 33 = 276
=> x = 276 : 12 = 23
b/ 148 + (78 + x) = 244
=> 78 + x = 148 - 244 = -96
=> x = -96 - 78 = -174
c/ 45 - x = 49 + 52
=> 45 - x = 101
=> x = 45 - 101 = -56
d/ 707 - 3(x + 34) = 407
=> 3(x + 34) = 707 - 407 = 300
=> x + 34 = 300 : 3 = 100
=> x = 100 - 34 = 66
e/ 25.3 - x = 104
=> 75 - x = 104
=> x = 75 - 104 = -29
Giải:
Bài 1:
\(707-3\left(x+3\right)=407\)
\(\Leftrightarrow3\left(x-3\right)=300\)
\(\Leftrightarrow x+3=100\)
\(\Leftrightarrow x=97\)
Vậy \(x=97\).
Bài 2:
a) \(143-43.\left[\left(25:5\right)^2-5^2\right]\)
\(=143-43.\left(5^2-5^2\right)\)
\(=143-43.1\)
\(=143-43=100\)
b) \(7:7+49\left(2^3.15-5.4\right)\)
\(=1+49.\left(120-20\right)\)
\(=1+49.100\)
\(=4901\)
c) \(\left(2^3.9^4+9^3.45\right):\left(9^2.10-9^2\right)\)
\(=\left(8.9^4+9^4.5\right):\left(9^2.10-9^2\right)\)
\(=\left[9^4\left(8+5\right)\right]:\left[9^2\left(10-1\right)\right]\)
\(=9^4.13:9^3\)
\(=9.13=117\)
Chúc bạn học tốt!
707 - 3( x + 34 ) = 407
=> 3( x + 81 ) = 300
=> x + 81 = 100
=> x = 19
127 + 3( x + 17 ) = ( 47 : 45 )2
=> 3( x + 17 ) = ( 42 )2 - 127
=> 3( x + 17 ) = 256 - 127
=> 3( x + 17 ) = 129
=> x + 17 43
=> x = 26
x - 6 - ( 48 - 24. 2 : 6 - 3 ) = 100
x - 6 - ( 48 - 2 - 3 ) = 100
x - 6 - 43 = 100
x - 49 = 100
x = 149
[ ( 6x - 39 ) : 3 ] . 28 = 5628
( 6x - 39 ) : 3 = 201
6x - 39 = 603
6x = 642
x = 107
Chúc em hok tốt
Study well
\(707-3.(x+3^4)=407\)
\(\Rightarrow\)\(707-3.(x+81)=407\)
\(\Rightarrow\)\(3.(x+81)=707-407\)
\(\Rightarrow\)\(3.\left(x+81\right)=300\)
\(\Rightarrow\)\(\left(x+81\right)=300:3\)
\(\Rightarrow\)\(\left(x+81\right)=100\)
\(\Rightarrow\) \(x=100-81\)
Xin lỗi vì tôi có việc bận nên tí nữa sẽ làm tiếp
\(\Rightarrow\) \(x=19\)
`Answer:`
`\frac{x-1}{34}+\frac{x-2}{34}=\frac{x-3}{32}+\frac{x-4}{31}`
`<=>\frac{x-1}{34}-1+\frac{x-2}{33}-1=\frac{x-3}{32}-1+\frac{x-4}{31}-1`
`<=>\frac{x-35}{34}+\frac{x-35}{33}=\frac{x-35}{32}+\frac{x-35}{31}`
`<=>(x-35)(\frac{1}{34}+\frac{1}{33}-\frac{1}{32}-\frac{1}{31})=0`
`<=>x-35=0`
`<=>x=35`
a ) x ∈ ± 23 28 . b ) x ∈ − 23 6 ; 35 6 . c ) x ∈ − 17 60 ; 97 60 . d ) x ∈ 67 140 ; 143 140 .
Giải:
\(707-3\left(x+3^4\right)=407\)
\(\Leftrightarrow3\left(x+3^4\right)=300\)
\(\Leftrightarrow x+3^4=100\)
\(\Leftrightarrow x+81=100\)
\(\Leftrightarrow x=100-81=19\)
Vậy \(x=19\).
Chúc bạn học tốt!
707 - 3 . ( x + 34 ) = 407
707 - 3 . ( x + 81 ) = 407
3 . (x + 81) = 707 - 407
3 . (x + 81) = 300
x + 81 = 300 : 3
x + 81 = 100
x = 100 - 81
x = 9.