2.x-138=72
tìm x
2 nhân x -138 = 72
2x - 138 = 72
2x = 72 + 138
2x = 210
x = 210 : 2
x = 105
\(\text{~ Chúc học tốt ~ Ai ngang qua xin để lại 1 L - I - K - E}\)
2x=72+138=210\(\Leftrightarrow\)x=210/2=105
<=> 2.x = 72+138
<=> 2.x = 210
<=> x= 210/2 =<=> x= 105
12.( x - 1 ) : 3 = 35
2 . x - 138 =72
310 - ( 118 - x ) 217
a, => 12. ( x - 1 ) = 35 . 3
=> 12. ( x - 1 ) = 105
=> x - 1 = 105 : 12
=> x - 1 = 8,75
=> x = 8,75 + 1
=> x = 9,75
\(a,12.\left(x-1\right):3=35\)
\(12.\left(x-1\right)=35.3\)
\(12.\left(x-1\right)=105\)
\(x-1=105:12\)
\(x-1=\frac{35}{4}\)
\(x=\frac{35}{4}+1\)
\(x=\frac{39}{4}\)
\(b,2.x-138=72\)
\(2.x=72+138\)
\(2.x=210\)
\(x=210:2\)
\(=105\)
\(c,310-\left(118-x\right)=217\)
\(118-x=310-217\)
\(118-x=93\)
\(x=118-93\)
\(x=25\)
Học tốt
b, => 2x = 72 + 138
=> 2x = 210
=> x = 210 : 2
=> x = 105
72-x=50
2x-138=72
5.3x = 135
\(72-x=50\\ \Rightarrow x=22\)
\(2x-138=72\\ \Rightarrow2x=210\\ \Rightarrow x=105\)
\(5.3^x=135\\ \Rightarrow3^x=27\\ \Rightarrow3^x=3^3\\ \Rightarrow x=3\)
72−x=50⇒x=2272−x=50⇒x=22
2x−138=72⇒2x=210⇒x=1052x−138=72⇒2x=210⇒x=105
5.3x=135⇒3x=27⇒3x=33⇒x=3
1, Tìm x biết :
a, 2 * x - 138 = 8 * 9
b, { ( 6 * x - 72 ) : 2 - 84 ) } * 28 = 5628
c, 420 + 65 * 4 = ( x + 175 ) : 5 + 30
a)\(2.x-138=8.9\)
\(2.x-138=72\)
\(2.x=72+138\)
\(2.x=210\)
\(x=210\div2\)
\(x=105\)
b)\(\left\{\left(6x-72\right)\div2-84\right\}.28=5628\)
\(\left(6x-72\right)\div2-84=201\)
\(\left(6x-72\right)\div2=285\)
\(6x-72=570\)
\(6x=642\)
\(x=107\)
c)\(420+65.4=\left(x+175\right)\div5+30\)
\(420+260=\left(x+175\right)\div5+30\)
\(680=\left(x+175\right)\div5+30\)
\(650=\left(x+175\right)\div5\)
\(3250=x+175\)
\(3075=x\)
a) 2 * x - 138 = 72
2 * x = 72 + 138
x = 210 \ 2
x = 105
Mk thay x=y nha!!!
a)2xy-138=8x9
2xy-138=72
2xy=72+138
2xy=210
y=210:2
y=105
b){(6xy-72):2-84)}x28=5628
{(6xy-72):2-84)}x28=5628
{(6xy-72):2-84=201
{(6xy-72):2=285
(6xy-72)=570
6y=570+72
6y=642
=>y=107
c)420+65x4=(y+175):5+30
680=(y+175):5+30
650=(y+175):5
3250=y+175
y=3250-175
y=3075
Tìm số tự nhiên x, biết 3x – 138 = 72.
A: 70
B:22
C: 630
D: 198
1.Tim x,biết
a)2.x-138=23.32
b)231-(x-6)=1339÷13
c)[(6.x-72)÷2-84].28=5628
\(a.2.x-138=2^3.3^2\)
\(2.x-138=8.9\)
\(2.x-138=72\)
\(2.x\) \(=72+138\)
\(2.x\) \(=210\)
\(x\) \(=210:2\)
\(x\) \(=105\)
\(b.231-\left(x-6\right)=1339:13\)
\(231-\left(x-6\right)=103\)
\(x-6=231-103\)
\(x-6=128\)
\(x\) \(=128+6\)
\(x\) \(=134\)
\(c.\left[\left(6.x-72\right):2-84\right].28=5628\)
\(\left[\left(6.x-72\right):2-84\right]\) \(=5628:28\)
\(\left(6.x-72\right):2-84\) \(=201\)
\(\left(6.x-72\right):2\) \(=201-84\)
\(\left(6.x-72\right):2\) \(=117\)
\(6.x-72\) \(=117.2\)
\(6.x-72\) \(=234\)
\(6.x\) \(=234+72\)
\(6.x\) \(=306\)
\(x\) \(=306:6\)
\(x\) \(=51\)
mik nè
Tìm số tự nhiên x, biết 3x – 138 = 72. Giải thích
A:70
B:22
C:630
D:198
3x-138=72
3x= 72+138
3x= 210
x=70
chúc bạn học tốt nè
Bài 1: Tìm x là STN biết:
a) 4(x - 3) = 72 - 20220
b) 123 - 5 x (x + 4) = 38
c) 2x - 138 = 23.32
Mong giúp đỡ ạ!!!
a: =>4(x-3)=49-1=48
=>x-3=12
=>x=15
b: =>123-5(x+4)=38
=>5(x+4)=123-38=85
=>x+4=17
=>x=13
c: =>2x-138=9*8=72
=>2x=72+138=210
=>x=105
Bài toán: 138 - 72
Chú ý:
không được ghi ở trên(138-72=66)
461 - 76 =
413 - 86 =
952 - 99 =
138 - 72 = 66
461 - 76 = 385
413 - 86 = 327
952 - 99 = 853
Bài toán: 138 - 72
461 - 76 =
413 - 86 =
952 - 99 =
Toán lớp 2
138 - 72 = 66
461 - 76 = 385
413 - 86 = 327
952 - 99 = 853