tính bằng cách thuận tiện nhất 36x45\6x5 b 56x63\9x8
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{36x45}{6x5}\)
\(=\frac{6x6x5x9}{6x5}\)
\(=6x9\)
\(=54\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 36x45/6x5
=6x9/1x1
=54
b) 56x63/9x8
=7x7/1x1
=49
k mk nha mk k lai
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\frac{36\cdot45}{6\cdot5}\)
\(=\frac{6\cdot6\cdot5\cdot9}{6\cdot5}\)
\(=6\cdot9\)
\(=54\)
b) \(\frac{56\cdot63}{9\cdot8}\)
\(=\frac{7\cdot8\cdot9\cdot7}{9\cdot8}\)
\(=7\cdot7\)
\(=49\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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159.54+159.46
=159. (54+46)
=159. 100
=15900
12.5+3.12
=12. (5+3)
=12.8
=96
2.5+4.5+6.5+8.5
=5. (2+4+6+8)
=5. 20
=100
Cmt đầu nha bn
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 25 \(\times\)66 + 33 \(\times\) 25 + 25
= 25 \(\times\) 66 + 33 \(\times\) 25 + 25 \(\times\)1
= 25 \(\times\) ( 66 + 33 + 1)
= 25 \(\times\) ( 66 + 34)
= 25\(\times\) 100
2500
\(\dfrac{2}{3}\) \(\times\) \(\dfrac{9}{7}\) + \(\dfrac{4}{6}\) \(\times\) \(\dfrac{5}{7}\) - \(\dfrac{2}{3}\)
= \(\dfrac{2}{3}\) \(\times\) \(\dfrac{9}{7}\) + \(\dfrac{2}{3}\) \(\times\) \(\dfrac{5}{7}\) - \(\dfrac{2}{3}\) \(\times\) 1
= \(\dfrac{2}{3}\) \(\times\) ( \(\dfrac{9}{7}\) + \(\dfrac{5}{7}\) - 1)
= \(\dfrac{2}{3}\) \(\times\) ( 2 - 1)
= \(\dfrac{2}{3}\) \(\times\) 1
= \(\dfrac{2}{3}\)
\(\frac{36\times45}{6\times5}\)\(=\)\(\frac{6\times6\times9\times5}{6\times5}\)\(=\)\(54\)
\(\frac{56\times63}{9\times8}\)\(=\)\(\frac{8\times7\times9\times7}{9\times8}\)\(=\)\(49\)
cam on