![](https://rs.olm.vn/images/avt/0.png?1311)
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
100 dm2
846 dm2
53000 cm2
3 200 0000 m2
9 km2
320049 dm2
10 000 000 m2
3 m2
130029 cm2
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
345 - 612 + 1655 - 388
= (345 + 1655) - (612 + 388)
= 2000 - 1000
= 1000
345 - 612 + 1655 - 388
= (345 + 1655) - (612 + 388)
= 2000 - 1000
= 1000
Chúc cậu học tốt☘✿
![](https://rs.olm.vn/images/avt/0.png?1311)
\(B=\dfrac{1991}{1990}\times\dfrac{1992}{1991}\times\dfrac{1993}{1992}\times\dfrac{1994}{1993}\times\dfrac{955}{997}\)
\(B=\left(\dfrac{1991}{1990}\times\dfrac{1992}{1992}\times\dfrac{1993}{1993}\right)\times\dfrac{1994}{1990}\times\dfrac{955}{997}\)
\(B=1\times1\times1\times\dfrac{1994}{1990}\times\dfrac{955}{997}\)
\(B=1\times\left(\dfrac{997}{955}\times\dfrac{955}{997}\right)\)
\(B=1\times1\)
\(B=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(x\times5+3\right)\div34=54\times45\div6\)
\(\left(x\times5+3\right)\div34=2430\div6=405\)
\(x\times5+3=405\times34\)
\(x\times5+3=13770\)
\(x\times5=13770-3\)
\(x\times5=13767\)
\(x=2753,4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
345x2-107x2=690-214=476 hoặc bạn nhóm 2 ra ngoài
425x3-17x3=1275-51=1124 hoặc nhóm 3 ra ngoài
108x6-108x2=648-216=432 hoặc nhóm 108 ra
:))))))))))) dễ mà
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
=345 km2 - 180 km2
= 165 km2
a) 345km2 - 45m2 * 4
= 345000000m2 - 180m2
= 344999820m2