21/11*22/17:42/34
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\(=\dfrac{21}{11}\cdot\dfrac{22}{17}\cdot\dfrac{34}{42}=\dfrac{1}{2}\cdot2\cdot2=2\)
\(\frac{21}{11}\times\frac{22}{17}:\frac{42}{34}\)
\(=\frac{44}{17}:\frac{42}{34}\)
\(=\frac{44}{21}\)
Hok tốt
\(\frac{21}{11}.\frac{22}{17}\div\frac{42}{34}\)
\(=\frac{21}{11}.\frac{22}{17}.\frac{34}{42}\)
\(=\frac{21.22.34}{11.17.42}\)
\(=\frac{21.11.2.17.2}{11.17.2.21}\)
\(=2\)
\(\frac{22}{17}.\frac{34}{63}.\frac{21}{11}=\frac{11.2.17.2.21}{17.21.3.11}=\frac{2.2}{3}=\frac{4}{3}\)
\(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}\) = \(\dfrac{42}{17}\times\dfrac{68}{63}\) = \(\dfrac{8}{3}\)
Vì \(\dfrac{21}{11}\times\dfrac{22}{17}=\dfrac{21\times22}{11\times17}=\dfrac{42}{17}\)
Vậy:
\(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{63}{68}\) =\(\dfrac{42}{17}\times\dfrac{68}{63}\) =\(\dfrac{21\times2\times17\times4}{17\times21\times3}\) =\(\dfrac{8}{3}\) =
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=1275
21/11x22/17;42/34
=42/17:42/34
=2
=2 nha bạn
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