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a, \(\left(2600+6400\right)-3x=1200\)
\(\Rightarrow9000-3x=1200\)
\(\Rightarrow3x=7800\)
\(\Rightarrow x=2600\)
b, \(\left[\left(6x-72\right):2-84\right].28=5628\)
\(\Rightarrow\left(6x-72\right):2-84=201\)
\(\Rightarrow\left(6x-72\right):2=285\)
\(\Rightarrow6x-72=570\)
\(\Rightarrow6x=642\)
\(\Rightarrow x=107\)
a) (2600 + 6400) - 3x = 1200
9000 - 3x = 1200
3x = 9000 - 1200
3x = 7800
x = 2600
Vậy x = 2600
b) [(6x - 72) : 2 - 48].28 = 5628
(6x - 72) : 2 - 48 = 5628 : 28
(6x - 72) : 2 - 48 = 201
(6x - 72) : 2 = 201 + 48
(6x - 72) : 2 = 249
6x - 72 = 249.2
6x - 72 = 498
6x = 498 + 72
6x = 570
x = 570 : 6
x = 95
Vậy x = 95
\(\left[\left(6x-72\right):2-84\right].28=5628\)\(\Rightarrow\left(6x-72\right):2-84=5628:28=201\)
\(\Rightarrow\left(6x-72\right):2=201+84=285\)
\(\Rightarrow6x-72=285.2=570\)
\(\Rightarrow6x=570+72=642\)
\(\Rightarrow x=\frac{642}{6}=107\)
[ ( 6 . x - 72 ) : 2 - 84 ] . 28 = 5628
( 6 . x - 72 ) : 2 - 84 = 5628 : 28
( 6 . x - 72 ) : 2 - 84 = 201
( 6 . x - 72 ) : 2 = 201 + 84
( 6 . x - 72 ) : 2 = 285
6 . x - 72 = 285 . 2
6 . x - 72 = 570
6 . x = 570 + 72
6 . x = 642
x = 642 : 6
x = 107
a)[(6x-72)/2-84]/28=5628
(6x-72)/2-84=5628*28
3x-36-84=157584
3x=157584+36+84
3x=157704
x=157704/3
x=52568
b)14(x-3)-138=8*9
14(x-3)=72+138
x-3=210/14
x-3=15
x=15+3
x=18
c)2*3x-2*92=4*33
2*(3x-34)=2*2*33
3x=54+81
3x=135
nên x\(\in\phi\)
[( 6x - 72 ) : 2 - 84 ] . 28 = 5628
( 6x - 72 ) : 2 - 84 = 5628 : 28 = 201
( 6x - 72 ) : 2 = 201 +84 = 285
6x - 72 = 285 . 2 = 570
6x = 570 + 72 = 642
x = 642 : 6
x = 107
Ta có: [ ( 6 . x - 72 ) : 2 - 84 ] . 28 = 5628
( 6 . x - 72 ) : 2 - 84 = 5628 : 28
( 6 . x - 72 ) : 2 - 84 = 201
( 6 . x - 72 ) : 2 = 201 + 84
( 6 . x - 72 ) : 2 = 285
6 . x - 72 = 285 . 2
6 . x - 72 = 570
6 . x = 570 + 72
6 . x = 642
x = 642 : 6
x = 107
Vậy x = 107
a) (2600 + 6400) - 3 . x = 1200
9000 - 3.x = 1200
3x = 9000-1200
3x = 7800
x = 7800:3
x = 2600
b) câu này ko có tổng hả Công chúa nhí nhảnh? check lại giùm Nhi nha!
a) \(\left(2600+6400\right)-3x=1200\)
\(9000-3x=1200\)
\(3x=9000-1200\)
\(3x=7800\)
\(x=\frac{7800}{3}\)
\(x=2600\)
vậy \(x=2600\)
b) \(\left[\left(6x-72\right):2-84\right].28+5628=0\)
\(\left[\frac{6x}{2}-\frac{72}{2}-84\right].28+5628=0\)
\(\left[3x-36-84\right].28=-5628\)
\(3x-120=\frac{-5628}{28}\)
\(3x-120=-201\)
\(3x=-201+120\)
\(3x=-81\)
\(x=-27\)
vậy \(x=-27\)
[(6x − 72) : 2 − 84] . 28 = 5628
(6x – 72) : 2 – 84 = 5628 : 28
( 6x – 72) : 2 – 84 = 201
(6x – 72) : 2 = 201 + 84
( 6x – 72) : 2 = 285
6x – 72 = 285.2
6x – 72 = 570
6x = 570 + 72
6x = 642
x = 642 : 6
x = 107
Vậy x = 107