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a/ => X. (3,1+6,9)=25
=> X.10=25
=> X=25:10=5/2
b/ X.3 = 7,65-31,5.0,1
=> 3X=4,5
=> X=4,5:3 = 1,5
a) \(x.3,1+x.6,9+5,4=30,4\)
\(x.\left(3,1+6,9\right)+5,4=30,4\)
\(x.10+5,4=30,4\)
\(x.10=30,4-5,4\)
\(x.10=25\)
\(x=25\div10\)
\(x=\frac{5}{2}\)
b) \(31,5.0,1+x.3=7,65\)
\(3,15+x.3=7,65\)
\(a,x\times3,1+x\times6,9+5,4=30,4\)
\(x\times3,1+x\times6,9=30,4+5,4\)
\(x\times3,1+x\times6,9=35,8\)
\(x\times\left(3,1+6,9\right)=35,8\)
\(x\times10=35,8\)
\(x=35,8:10\)
\(x=3,58\)
y x 3,9 + y : 10 = 2,7 câu 2 bạn tự làm nha
= y x 3,9 + y x 0,1=2,7
= y x ( 3,9 + 0,1 ) = 2,7
= y x 4 = 2,7
y = 2,7 : 4
y = 0, 675
\(a,\)\(71+65\times4=\frac{x+140}{x}+260\)
\(\Rightarrow71+260=\frac{x-140}{x}+260\)
\(\Rightarrow71=\frac{x-140}{x}\)
\(\Rightarrow71x=x-140\)
\(\Rightarrow71x-x=-140\)
\(\Rightarrow70x=-140\)
\(\Rightarrow x=-2\)
\(b,\)\(y\times\frac{15}{2}-\frac{1}{3}\times\left(\frac{1}{4}+y\right)=90\frac{2}{3}\)
\(\Rightarrow\frac{15y}{2}-\frac{1}{12}-\frac{y}{3}=\frac{272}{3}\)
\(\Rightarrow\frac{90y}{12}-\frac{1}{12}-\frac{4y}{12}=\frac{1088}{12}\)
\(\Rightarrow90y-1-4y=1088\)
\(\Rightarrow86y=1089\)
\(\Rightarrow y=\frac{1089}{86}\)
\(a)\) \(\frac18\times y\times\frac14=\frac12\)
\(\frac18\times y=\frac12:\frac14\)
\(\frac18\times y=2\)
\(y=2:\frac18\)
\(y=16\)
Vậy \(y=16.\)
\(b)y\times3,1+y\times6,9+5,4=30,4\)
\(y\times\left(3,1+6,9\right)+5,4=30,4\)
\(y\times10+5,4=30,4\)
\(y\times10=30,4-5,4\)
\(y\times10=25\)
\(y=25:10\)
\(y=2,5\)
Vậy \(y=2,5.\)
\(c)31,5\times0,1+y\times3=7,65\)
\(3,15+y\times3=7,65\)
\(y\times3=7,65-3,15\)
\(y\times3=4,5\)
\(y=4,5:3\)
\(y=1,5\)
Vậy \(y=1,5.\)
`1/8 xx y xx 1/4 = 1/2`
`=> y = 1/2 : 1/4 : 1/8`
`=> y = 1/2 xx 4 xx 8`
`=> y = 32/2`
`=> y = 16`
Vậy `y = 16`