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1,7 x 3,4 + 4,3 x 1,7 + 2,3 x 1,7
= 1,7 x ( 3,4 + 4,3 + 2,3 )
= 1,7 x 10
= 17
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=3,24\times1,7+1,7\times4,65-6,89\times1,7\)
\(=1,7\times\left(3,24+4,65-6,89\right)\)
\(=1,7\times1\)
\(=1,7\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1.Ta có:1/2=1/1.2
1/6=1/2.3
1/12=1/3.4
........
=>1/2+1/6+1/12+1/20+1/30=1/1.2+1/2.3+1/3.4+1/4.5+1/5.6
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1-1/6
=5/6
2.hinh nhu sai đe
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x\times1,2+x+1,7+x=2,4\)
=> \(x\times1,2+2\times x+1,7=2,4\)
=> \(x\times\left(1,2+2\right)=2,4-1,7\)
=> \(x\times3,2=0,7\)
=> \(x=0,7:3,2=\frac{7}{32}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x.4+x.2+x.5=1,7\)
\(x.\left(4+2+5\right)=1,7\)
\(11.x=1,7\)
\(x=\frac{1,7}{11}\)
Vậy ...
k mình nhé!
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0,17 x 250 + 63 x 1,7 - 87 x 1,7
=1,7x25+ 63 x 1,7 - 87 x 1,7
=1,7x(25+63-87)
=1,7x1
=1,7
\(0,17\times250+63\times1,7-87\times1,7\)
\(=0,17\times10\times25+63\times1,7-87\times1,7\)
\(=1,7\times25+63\times1,7-87\times1,7\)
\(=1,7\times\left(25+63-87\right)\)
\(=1,7\times1\)
\(=1,7\)