y/9 = 84/108

=> y.108 = 9 . 84

=> y.108 = 756

=> y = 756 : 108

=> y = 7

y/9 = 84/108 = 7/9

=> y = 7

Vậy y = 7

Tk mk nha

Câu 10:

\(a,y\times7+y\times3=70\\ \Rightarrow y\times\left(7+3\right)=70\\ \Rightarrow y\times10=70\\ \Rightarrow y=7\\ b,18:y+12:y=3\\ \Rightarrow\left(18+12\right):y=3\\ \Rightarrow30:y=3\\ \Rightarrow y=10\)

câu 11:

\(a,9\times365+2\times365-365=\left(9+2-1\right)\times365=10\times365=3650\\ b,108:9-18:9=\left(108-18\right):9=90:9=10\\ c,43\times95+4\times43+43=43\times\left(95+4+1\right)=43\times100=4300\)

x = 42

y = 12

x = 42, y = 12;

Y:84=106/84

<=>y=106/84 x 84=(106 x 84)/84=106

 vậy y=106

minh nghi la 1 nhung chua chac

=>117:y=9

hay y=13

>117:y=9

Ta có:

189:y+54:y=9

(189+54):y=9

243:y=9

y=243:9

y=27

Vậy y=27.

Đáp án B

`1-(12/5+y-8/9):16/9=0`

`=> (12/5+y-8/9):16/9=1-0`

`=> (12/5+y-8/9):16/9 =1`

`=> 12/5+y-8/9=1xx16/9`

`=> 12/5+y-8/9=16/9`

`=> 12/5+y=16/9+8/9`

`=> 12/5+y=8/3`

`=> y=8/3-12/5`

`=> y=4/15`

ai làm đc mình tích và like nha

9×y=16895+13867

9×y=30762

y=30762:9

y=3418

Đáp án A

y + y x 9 : 3 - y x 4 + y x 7 = 105

y x 1 + y x 3 - y x 4 + y x 7 = 105

y x ( 1 + 3 - 4 + 7 ) = 105

y x 7 = 105

y = 105 : 7

y = 15

Vậy y = 15

y+y*9:3-y*4+y*7=105

y+y*3-y*4+y*7=105

y*(1+3-4+7)=105

y*7=105

y=105:7

y=15