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= y + 4 + y + 6 + y + 8 + ... + y + 26 = 210
=> (y + y + y+ ... + y) + (4 + 6 + 8 + ... + 26) = 210
=> 12y + 180 = 210
12y = 210 -180
12y = 30
y = 30 : 12
y = 2.5
Đáp số : 2.5
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\(78\cdot15-\frac{28}{50}+78\cdot14\)
\(=78\cdot\left(15-14\right)+\frac{14}{25}\)
\(=78\cdot1+\frac{14}{25}\)
\(=78+\frac{14}{25}=78\frac{14}{25}\)
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210:y=14,75+6,25
210:y=21
=> y=210:21=10
Ủng hộ mk nka!!!^_^
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52 \(\times\) ( y : 78) = 3380
y : 78 = 3380: 52
y : 78 = 65
y = 65 \(\times\) 78
y = 5070
y: 55 - y + 33 = 76
\(y\) \(\times\) ( \(\dfrac{1}{55}\) - 1) = 76 - 33
y \(\times\) ( \(\dfrac{-54}{55}\) ) = 43
y = 43 : (- \(\dfrac{54}{55}\))
y = - \(\dfrac{2365}{54}\)
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210 : y = 14.75 + 6.25
=>210 : y = 21
=> y = 210 : 21=10
vậy y = 10
k nha
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52 x ( y : 78 ) = 3380
( y : 78 ) = 3380 : 52
( y : 78 ) = 65
y = 65 x 78
y = 5070
78 x y + 28 x y = 210
y x ( 78 + 28) = 210
y x 106 = 210
y = 210/106
y = 105/53