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486 : y - 126 : y = 6
( 486 - 126 ) : y = 6
360 : y = 6
=> y = 360 : 6
y= 60
b, y x 70 = 42000 : 60
y x 70 = 700
y = 700 : 70
y = 10
a)
\(486:y-126:y=6\)
\(\left(486-126\right):y=6\)
\(360:y=6\)
\(y=360:6\)
Vậy \(y=60\)
b)
\(y\times70=42000:60\)
\(y=\frac{42000:60}{70}\)
Vậy \(y=10\)
nha

a/ (y+2/9):7/4=11/7
y+2/9=11/7.7/4
y+2/9=11/4
y=11/4-2/9
y=91/36

y x 500 = 780 000
y = 780 000 : 500
y = 1560
y x 120 = 12000
y = 12000 : 120
y = 100
y : 145 = 318
y = 318 x 145
y = 46110
y : 213 = 456
y = 456 x 213
y= 97128
y x 70 = 238
y = 238 : 70
y = 3.4
y x 78 = 936
y = 936 : 78
y = 12
462 : y = 66
y = 462 : 66
y = 7
709 : y = 82
y = 709 : 82
y = 8.64634146341
y x 500 = 780 000
y = 780 000 : 500
y = 1560
y x 120 = 12000
y = 12000 : 120
y = 100
y : 145 = 318
y = 318 x 145
y = 46110
y : 213 = 456
y = 456 x 213
y= 97128
y x 70 = 238
y = 238 : 70
y = 3.4
y x 78 = 936
y = 936 : 78
y = 12
462 : y = 66
y = 462 : 66
y = 7
709 : y = 82
y = 709 : 82
y = 8.64634146341

\(y\times\frac{3}{5}+y\times\frac{2}{7}=\frac{31}{70}\)
\(\Leftrightarrow y\times\left(\frac{3}{5}+\frac{2}{7}\right)=\frac{31}{70}\)
\(\Leftrightarrow y\times\frac{31}{35}=\frac{31}{70}\)
\(\Leftrightarrow y=\frac{1}{2}\)

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


y + 40 = 30 +70 +10
= y +40 = 30 +10 +70
= y +40 = 40 + 70
=> y = 70
y + 40 = 30 + 70 + 10 = 40 + 70
Vì y + 40 = 40 + 70 nên y = 70
Vậy, y = 70

\(y\cdot6+y\cdot4=70\)
\(\Leftrightarrow y\cdot\left(6+4\right)=40\)
\(\Leftrightarrow10y=70\)
\(\Leftrightarrow y=7\)
`yxx6+yx4=70`
`yxx(4+6)=70`
`yxx10=70`
`y=70:10`
`y=7`