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a. \(\frac{7}{3}\)+ \(\frac{2}{5}\): y = \(1\frac{1}{3}\)
\(\frac{2}{5}\): y = -1
y = \(-\frac{2}{5}\)
b. 52(y : 78) = 3380
y : 78 = 65
y = 5070
c. 55 - y + 33 = 76
55 - y = 76 - 33
y = 55 - 43
y = 12
![](https://rs.olm.vn/images/avt/0.png?1311)
\(52\times\left(x\div78\right)=3380\)
\(\Leftrightarrow x\div78=65\)
\(\Leftrightarrow x=5070\)
\(52\times\left(x\div78\right)=3380\)
\(x\div78=3380\div52\)
\(x\div78=65\)
\(x=65\times78\)
\(x=5070\)
Vậy \(x=5070\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1) 2-2+2-2=0;2/2*2/2=1;2/2+2/2=2;2-2/2+2=3;2+2-2+2=4;2+2+2/2=5;2*(2/2+2)=6;2+2+2+2=8;22/2-2=9;(22-2)/2=10
(còn số 7 không làm được)
2) a) \(52\cdot\frac{y}{78}=3380\)
\(52\cdot\frac{1}{78}\cdot y=3380\)
\(\frac{2}{3}\cdot y=3380\)
\(y=3380\div\frac{2}{3}=5070\)
b)\(55-y+33=76\)
\(88-y=76\)
\(y=88-76=12\)
3)\(3,54\cdot73+0,23\cdot25+3,54\cdot27+0,17\cdot25\)
\(=3,54\cdot\left(73+27\right)+25\cdot\left(0,27+0,13\right)\)
\(=3,54\cdot100+25\cdot0,4\)
\(=354+10=364\)
![](https://rs.olm.vn/images/avt/0.png?1311)
52 x ( y : 78 ) = 3380
( y : 78 ) = 3380 : 52
( y : 78 ) = 65
y = 65 x 78
y = 5070
![](https://rs.olm.vn/images/avt/0.png?1311)
55 – y + 33 = 76
55 - y = 76 – 33
55 - y = 43
y = 55 – 43
y = 12
52 \(\times\) ( y : 78) = 3380
y : 78 = 3380: 52
y : 78 = 65
y = 65 \(\times\) 78
y = 5070
y: 55 - y + 33 = 76
\(y\) \(\times\) ( \(\dfrac{1}{55}\) - 1) = 76 - 33
y \(\times\) ( \(\dfrac{-54}{55}\) ) = 43
y = 43 : (- \(\dfrac{54}{55}\))
y = - \(\dfrac{2365}{54}\)