a.7/18+5/3*13/9/55/4
b.72*202*38/303*63*16
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\(\frac{72\cdot202\cdot28}{303\cdot63\cdot16}=\frac{8\cdot9\cdot101\cdot2\cdot4\cdot7}{101\cdot3\cdot7\cdot9\cdot8\cdot2}=\frac{4}{3}\)
\(\dfrac{72\times202\times28}{303\times63\times16}=\dfrac{8\times9\times2\times101\times4\times7}{7\times9\times3\times101\times16}=\dfrac{\left(8\times2\times4\right)\times\left(9\times101\times7\right)}{\left(16\times3\right)\times\left(9\times101\times7\right)}=\dfrac{4}{3}\)
\(\dfrac{72\cdot202\cdot28}{303\cdot63\cdot16}=\dfrac{2^3\cdot9\cdot101\cdot2\cdot7\cdot4}{101\cdot3\cdot7\cdot9\cdot2^3\cdot2}\)
\(=\dfrac{4}{3}\)
\(\frac{72}{303}\cdot\frac{202}{63}\cdot\frac{28}{16}\)
\(=\frac{16}{21}\cdot\frac{28}{16}\)
\(=\frac{4}{3}\)
hok tốt
2/3 + 3/4=17/12
9/4 + 3/5=57/20
5/24 + 1/4=11/24
3/15 - 5/35=2/35 18/27 - 2/6=1/3 37/12 - 3=1/12
11/9 x 3/22=1/6 7/13 x 13/7=1 4 x6/7=24/7
2/5 : 3/10=4/3 3/8 : 9/4=1/6 8/21 : 4/7=2/3