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a, 2(x - 51) = 2.23 + 20
=> 2(x - 51) = 2.8 + 20
=> 2(x - 51) = 16 + 20
=> 2(x - 51) = 36
=> x - 51 = 18
=> x = 69
vậy_
b, 32(x + 4) - 52 = 5.22
=> 9(x + 4) - 25 = 5.4
=> 9x + 36 - 25 = 29
=> 9x + 9 = 29
=> 9x = 20
=> x = 20/9
vậy_
\(2(x-51)=2\cdot2^3+20\)
\(2(x-51)=2\cdot8+20\)
\(2(x-51)=16+20\)
\(2(x-51)=36\)
\(x-51=36:2\)
\(x-51=18\)
\(x=18+51\)
\(x=69\)
2 ( x - 51 ) = 2 . 23 + 20
2 ( x - 51 ) = 24 + 20
2 ( x - 51 ) = 16 + 20
2 ( x - 51 ) = 36
( x - 51 ) = 36 : 2
( x - 51 ) = 18
x = 18 + 51
x = 69
Vậy x = 69
Tk nhé!!!
Tìm x, biết:
a) 198 - ( x + 4 ) = 120
(x+4) = 198-120
x+ 4 =78
x= 78 - 4
x= 74
b) 2(x-51) = 2.23 + 20
2(x-51)=36
x-51 = 36:2
x-51=18
x=18+51
x=69
c) 450 : ( x - 19 ) = 50
x-19= 450:50
x-19=9
x=9+19
x=28
d)4(x-3) = 72 - 110
4(x-3) =48
x-3 = 48:4
x-3=12
x=12+3
x=15
a) 198 - ( x + 4 ) = 120
=>x+4=78
=>x=744
b) 2(x-51) = 2.23 + 20
=>
a) \(\text{2(x-51)=2.2^2+20}\)
\(2\left(x-51\right)=2.4+20\)
\(2\left(x-51\right)=28\)
\(x-51=28\div2\)
\(x-51=14\)
\(x=14+51\)
\(\text{b)3.(x+1)-26=541}\)
\(3.\left(x+1\right)=541+26\)
\(3\cdot\left(x+1\right)=567\)
\(x+1=567\div3\)
\(x+1=189\)
\(x=189-1\)
\(x=188\)
\(x=65\)
\(\text{c)4(x-3)=7^2-1^10}\)
\(4\left(x-3\right)=49-1\)
\(4\left(x-3\right)=48\)
\(x-3=48\div4\)
\(x-3=12\)
\(x=12+3\)
\(x=15\)
\(\text{e)2x-138=2^3.3^2}\)
\(2x-138=8\cdot9\)
\(2x-138=72\)
\(2x=72+138\)
\(2x=210\)
\(x=210\div2\)
\(x=105\)
\(\text{f)(x-1)^4=16}\)
\(\left(x-1\right)^4=2^4\)
\(x-1=2\)
\(x=2+1\)
\(x=3\)
\(2\left(x-51\right)=2.2^2+20.\)
\(\Leftrightarrow2x-102=2.4+20\)
\(\Leftrightarrow2x-102=28\)
\(\Leftrightarrow2x=28+102\)
\(\Leftrightarrow2x=130\)
\(\Leftrightarrow x=130\div2\)
\(\Leftrightarrow x=65\)
2( x - 51 ) = 2.22 + 20
2( x - 51 ) = 2.4 +20
2( x - 51 ) = 28
x - 51 = 28 : 2
x - 51 = 14
x = 14 + 51
x = 65
1. a) 17.85 + 15.17 - 120
= 17.( 85 + 15) - 120
= 17. 100 -120
= 1700 - 120
= 1580
b) 20 - [ 30 - (5 - 1)2 ]
= 20 - [ 30 - 42 ]
= 20 - [ 30 - 16 ]
= 20 - 14
= 6
2. 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
b) 10 + 2.x = 45 : 43
10 + 2.x = 42
10 + 2.x = 16
2.x = 16 - 10
2.x = 6
x = 6 : 2
x =3
1)a:17.85+15.17-120=17.(85+15)-120=17.100-120=1700-120=1580
b: 20-[30-(5-1)^2 = 20-[30-4^2]=20-(30-16)=20-15=5
2)
a: 70-5(x-3)=45
5(x-3) = 70-45=25
x-3 = 25:5=5
x= 5+3=8
b: 10+2x = 4^5:4^3
10+2x = 4^2
10+2x = 16
2x = 16-10=6
x = 6:2=3
\(2\times\left(x-51\right)=2\times2^3+20\)
\(2\times\left(x-51\right)=2^4+20\)
\(2\times\left(x-51\right)=16+20\)
\(2\times\left(x-51\right)=36\)
\(x-51=36:2\)
\(x-51=18\)
\(x=18+51\)
\(x=69.\)
\(70-5\times\left(x-3\right)=45\)
\(5\times\left(x-3\right)=70-45\)
\(5\times\left(x-3\right)=25\)
\(x-3=25:5\)
\(x-3=5\)
\(x=5+3\)
\(x=8.\)