a) X : 56 + 278 = 2013
b) 9213 - X : 78 = 8927
278 x 305 672 x 78 1956 x 420
378 x 305 = 115290
672 x 78 = 52614
1956 x 420 =821520
23+x=78=456
x-56=78
x+56=56
Phần đầu mình không biết
x= 78-56
x= 22
x= 56-56
x=0
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Tìm a, biết: a x 1+a x 2+a x 3+a x 4+a x 5..........+ a x 50=8927
12+34+56+78+56=45+x-23=1234-x+56
a) x + 123 - 45 = 678
b) 78 - 56 + x = 234
x + 123 - 45 = 678
x= 678 + 45 - 123
x = 600
78 - 56 + x = 234
22 + x = 234
x = 234 - 22
x = 212
Linh Nguyễn sai rồi
a) x+123-45=678
=>x+78=678
=>x=678-78
=>x=600
tíc mình nha
a) x + 123 - 45 = 678
x = 678 + 45 - 123
x = 600
b)78 - 56 + x = 234
56 + x = 76 - 234
56 + x = -158
x = -158 - 56
x = -214
nha bn
chúc bn học giỏi
tìm x =
a. 678-x = 56+ 79
b. 34 ; x = 66=78
a. 678 - x = 56 + 79
678 - x = 135
x = 678 - 135
x = 543
b. Sai đề rùi bn ơi
a).678-x = 56+ 79
678-x = 135
x = 678 - 135
x = 543
tim x:
x+56 =78
a k mik mik k lai
1+2+4+5+3+5+7+5+5+52+78+85+572+78+78+78+78+78+57-2578-78-8787+587-87+578-45+278-278-86-87-37-8-8-8+78-8-+78-82+78-86
10645 nha chúc bạn học tốt
a, 3.(37 - \(x\)) - 56 = 1
3.(37 - \(x\)) = 1 + 56
3.(37 - \(x\)) = 57
37 - \(x\) = 57 : 3
37 - \(x\) = 19
\(x\) = 37 - 19
\(x\) = 18
b, 95 - (2\(x\) - 1).4 = 14
(2\(x\) - 1).4 = 95 - 14
(2\(x\) - 1).4 = 81
2\(x\) - 1 = 81 : 4
2\(x\) = \(\dfrac{81}{4}\) - 1
2\(x\) = \(\dfrac{85}{4}\)
\(x\) = \(\dfrac{85}{4}\) : 2
\(x\) = \(\dfrac{85}{8}\)
c,
-45 + (\(x\) - 15) = 23
- 45 + \(x\) - 15 = 23
- (45 + 15) + \(x\) = 23
- 60 + \(x\) = 23
\(x\) = 23 + 60
\(x\) = 83