28

nhầm

y x 3=84

y=84:3

y=28

y=28 nha bạn

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

 Yx(7+1-3+5)=7800
Yx10=7800
Y=7800:10
Y=780
 

y x 3 + y : 2 = 110

y x 3 + y x 0,5 = 110

y x ( 3 + 0,5 ) = 110

y x 3,5 = 110

y = 110 : 3,5

y = ??????????

yx3=246-12

yx3=234

y=234:3

y=78

y:3+5=215

y:3=215-5

y:3=210

y=210x3

y=630

y x 3= 246 - 12

3y= 246 -12

3y= 234 = 78

y= 78

+) \(Y\times3=246-12\)

    \(Y\times3=234\)

    \(Y=78\)

+) \(Y:3+5=215\)

    \(Y:3=210\)

    \(Y=630\)

Yx7+Yx3 =60

Y x (7+3)=60

Yx10=60

Y=60:10

Y=6

7y+3y=60

10y=60

y=6

Y x 7 + Y x 3 = 60

Y x (7 + 3) = 60

Y x 10 = 60

Y = 60 : 10

Y = 6 

\(42-3y=30\)

\(3y=42-30=12\)

\(y=12:3=4\)

yx3+y/2+y/4=11/2:y

yx3+y:2+y:4=5,5:y

yx3+y:(2+4)=5.5:y

yx3+y:6=5,5:y

yx3+yx1/6=5,5:y

yx(3+1/6)=5,5:y

yx19/6=5,5:y

...........................

bn ơi là 1\(\frac{1}{2}\)