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a) 5(x + 35) = 515
x + 35 = 515 : 5
x + 35 = 103
x = 103 - 35
x = 68
b) 12x - 33 = 32.33
12x - 33 = 35
12x - 33 = 243
12x = 243 + 33
12x = 276
x = 276 : 12
x = 23
c) 541 + (218 - x) = 73
218 - x = 73 - 541
218 - x = -468
-x = -468 - 218
-x = -686
x = 686
d) 1230 : 3(x - 20) = 10
410(x - 20) = 10
x - 20 = 10 : 410
x - 20 = 1/41
x = 1/41 + 20
x = 821/41
5(x+ 35 ) = 515
x + 35 = 103
x = 68
12x - 33 = 32 . 33
12x = 276
x = 23
541 + ( 218 - x ) = 73
218 - x = - 468
x = - 250
1230 : 3( x - 20 ) = 10
=> 3x - 60 = 123
=> 3x = 183
=> x = 61
Study well
a)=>5.(x-3)=70-45 b)=>2x-138=8.9 c)=>10+2x=4^2 d)=>231-(x-6)=103
=>5.(x-3)=25 =>2x=138+72 =>2x=16-10 => x-6=231-103
=>x-3=25:5 =>x=210:2 =>2x=6 =>x-6=128
=>x-3=5 =>x=105 =>x=3 =>x=128+6
=>x=8 =>x=134
1) \(541+\left(218-x\right)=375\)
\(\Leftrightarrow759-x=375\)
\(\Leftrightarrow x=384\)
2) \(5\cdot\left(x+35\right)=515\)
\(\Leftrightarrow x+35=103\)
\(\Rightarrow x=68\)
3) \(96-3\cdot\left(x+1\right)=42\)
\(\Leftrightarrow3\cdot\left(x+1\right)=54\)
\(\Leftrightarrow x+1=18\)
\(\Rightarrow x=17\)
4) \(2\cdot x-138=2^3\cdot3^2\)
\(\Leftrightarrow2\cdot x-138=72\)
\(\Leftrightarrow2\cdot x=210\)
\(\Rightarrow x=105\)
a).\(541+\left(218-x\right)=735\)
\(218-x=735-541\)
\(218-x=194\)
\(x=218-194\)
\(x=24\)
b).\(5\left(x+35\right)=515\)
\(x+35=515:5\)
\(x+35=103\)
\(x=103-35\)
\(x=68\)
c).\(96-3\left(x+1\right)=42\)
\(3\left(x+1\right)=96-42\)
\(3\left(x+1\right)=54\)
\(\left(x+1\right)=54:3\)
\(\left(x+1\right)=18\)
\(x=18-1\)
\(x=17\)
d)\(12x-33=3^2\cdot3^3\)
\(12x-33=3^5\)
\(12x-33=243\)
\(12x=243+33\)
\(12x=276\)
\(x=276:12\)
\(x=23\)
\(Nhớ\)\(tk\)\(mình\)\(nha\)\(!\)
a) 80 - [130 - (12 -4)2 ]
= 80 - ( 130 - 82 )
= 80 - 116
= -36
b) 541 + (218 - b) = 735
218 - b = 194
b = 24
c) 5(x + 35) =515
x+35 = 103
x = 68
d) 96 - 3(x + 1) = 42
3(x+1) = 54
x+1 = 18
x = 17
12x - 33 = 32 . 33
12x - 33 = 243
12x = 276
x = 23
a,70 – 5.(x – 3) = 45
5.(x -3) = 70 - 45
5.(x – 3) = 25
x – 3 = 25 : 5
x – 3 = 5
x = 5 + 3
x = 8
Vậy x = 8
b,\(2x-138=8x9=72\)
\(2x=138+72=210\)
\(x=210:2=105\)
c,\(10+2x=4^2\)\(=16\)
\(2x=16-10=6\)
\(x=6:2=3\)
d, 231 – (x- 6) = 1339 : 13
231 – (x – 6) = 103
x – 6 = 231 – 103
x – 6 = 128
x = 128 + 6
x = 134
Vậy x = 134
a) 541+ ( 218 - x ) = 735
218 - x = 735 - 541
218 - x = 194
x= 218 - 194
x= 24
b) 12 . x - 33 = 32 . 33
12 . x - 33 = 9 . 27
12 . x - 33 = 243
12 . x = 243 + 33
12 . x = 276
x = 276 : 12
x = 23
c) 231 - ( x-6 ) = 1339 : 13
231 - ( x- 6) = 103
x- 6 = 231- 103
x-6 = 128
x= 128 + 6
x = 134
CHÚC BN HỌC GIỎI ;)
Bài làm :
\(a,541+\left(218-x\right)=735\)
\(218-x=735-541\)
\(218-x=194\)
\(x=218-194\)
\(x=24\)
\(b,12.x-33=3^2.3^3\)
\(12x=243+33\)
\(12x=276\)
\(x=23\)
\(c,231-\left(x-6\right)=1339:13\)
\(x-6=231-103\)
\(x-6=128\)
\(x=134\)
\(d,2.x-138=2^3.3^2\)
\(2x-138=72\)
\(2x=72+138\)
\(2x=210\)
\(x=105\)
\(e,2^x.4=128\)
\(2^x=128:4\)
\(2^x=32\)
\(2^x=2^5\)
\(\Rightarrow x=5\)
\(g,x^5=x\)
\(\Rightarrow\orbr{\begin{cases}x=0\\x=1\end{cases}}\)
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