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21 : (y+3)x4=100-88
21:(y+3)x4=12
21:(y+3)=12 :4
21:(y+3)=3
y+3=21:3
y+3=7
y=7-3
y=4
Đáp số y=4
\(21:\left(y+3\right)\times4+88=100\)
\(21:\left(y+3\right)\times4=100-88\)
\(21:\left(y+3\right)\times4=12\)
\(21:\left(y+3\right)=12:4\)
\(21:\left(y+3\right)=3\)
\(y+3=21:3\)
\(y+3=7\)
\(y=7-3\)
\(y=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, ( 372 + 300 ) : ( y x 3 ) = 8
672 : ( y x 3 ) = 8
y x 3 = 672 : 8
y x 3 = 84
y = 84 : 3
y = 28
b, 21 : ( y + 3 ) x 4 + 88 = 100
21 : ( y + 3 ) x 4 = 100 - 88
21 : ( y+3)x4 = 12
21 : ( y + 3 ) = 12 : 4
21 : ( y + 3 ) = 3
y + 3 = 21 : 3
y + 3 = 7
y = 7 - 3
y = 4
a) (372+300): (y x 3) =8
=> 672:8 = y x 3
=> 84 = y x 3
=> 84/3 = y
=> y = 28
b) 21:(y+3)x4 + 88 =100
=> 21: ( y+3) x 4=100-88
=>21 : (y+3) x 4 =12
=>21 : ( y+3 )=12/4
=>21 : (y+3)=3
=> 21/3=y+3
=>7=y+3
=>y=7-3
=>y=4
![](https://rs.olm.vn/images/avt/0.png?1311)
21 : (y + 3) x4=100-88
21 : (y + 3) x4=12
21 : (y + 3)=12:4
21: (y + 3)=3
y + 3=21 : 3
y + 3=7
y=7 - 3
y=4
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
y x 3 - y = 100 - 88
=> y x ( 3 - 1 ) = 12
=> y x 2 = 12
=> y = 12 : 2
=> y = 6
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
88 + 88 + 99 + 99 + 100 + 100
= 88 x 2 + 99 x 2 + 100 x 2
= 176 + 198 + 200
= 574
21:(y+3)x4+88=100
21:(y+3)x4 =100-88
21:(y+3)x4 = 12
21:(y+3) =12:4
21:(y+3) =3
y+3 = 21:3
y+3 =7
y =7-3
y =4
Vậy y = 4