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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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14,75 + 8,96 + 6,25 = (14, 75 + 6,25) + 8,96
= 21 + 8,96
= 29,96
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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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Câu 1 ko hiểu đề bài lắm
\(2.Y\times\left(2+0,5\right)=6,25\)
\(Y\times2,5=6,25\)
\(Y=6,25:2,5\)
\(Y=2,5\)
\(3.Y\times6=99,75:4,75\)
\(Y\times6=21\)
\(Y=21:6\)
\(Y=3,5\)
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a, ( 5 x y - 15 ) : 5 = 0
( 5 x y - 15 ) = 0 x 5
( 5 x y - 15 ) = 0
5 x y = 0 + 15
5 x y = 15
y = 15 : 5
y = 3
b. 14 x ( y - 7 ) = 210
( y - 7 ) = 210 : 14
( y - 7 ) = 15
y = 15 + 7
y = 22
c. 84 - 4 x ( 2 x y + 1 ) = 48
4 x ( 2 x y + 1 ) = 84 - 48
4 x ( 2 xy + 1 ) = 36
( 2 x y + 1 ) = 36 : 4
( 2 x y + 1 ) = 9
2 x y = 9 - 1
2 x y = 8
y = 8 : 2
y = 4
d. 5 x y - 2009 = 1201
5 x y = 1201 + 2009
5 x y = 3210
y = 3210 : 5
y = 642
a. (5.y-15):5=0
=> 5.y-15 = 0
=> 5.y = 15
=> y = 3
b. 14.(y-7) = 210
=> y-7 = 15
=> y = 22
c. 84-4.(2.y+1)=48
=> 4.(2.y+1) = 36
=> 2.y+1 = 9
=> 2.y = 8
=> y = 4
d) 5.y-2009 = 1201
=> 5.y = 3210
=> y = 642
210 : y = 14.75 + 6.25
=>210 : y = 21
=> y = 210 : 21=10
vậy y = 10
k nha
210 : y = 14,75 + 6,25
210 : y =21
y=210:21
y=10