17/21*48/53+17/21*4/53+52/53*4/21
Làm giúp mik với nha
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\(\frac{8}{29}+\frac{4}{21}-53\frac{3}{53}+\frac{17}{21}-\frac{27}{19}\)
\(=\left(\frac{8}{19}-\frac{27}{19}\right)+\left(\frac{4}{21}+\frac{17}{21}\right)-53\frac{3}{53}\)
\(=-1+1-53\frac{3}{53}=0-53\frac{3}{53}=-53\frac{3}{53}\)
-(-21+43+7) - (11-53-17)
= -(22+7) - (-42 -17)
= (-29) - (-59)
= +( 59-29)
=+30 ( hay bn ghi 30 cx đc nha)
bài này dễ mà
47 x 83 + 21 x 53 + 47 x 17 - 79 x 53
= 47 x (83 + 17) + 53 x (21 - 79)
= 47 x 100 + 53 x (-58)
= 4700 - 3074
= 1626
\(47.83+21.53+47.17-79.53\)
\(=47.\left(83+17\right)+53.\left(79+21\right)\)
\(=47.100+53.100\)
\(=4700+5300\)
\(=10000\)
\(\frac{17}{21}\cdot\frac{48}{53}+\frac{17}{21}\cdot\frac{4}{53}+\frac{52}{53}\cdot\frac{4}{21}\)
\(=\frac{17}{21}\left(\frac{48}{53}+\frac{4}{53}\right)+\frac{52}{53}\cdot\frac{4}{21}\)
\(=\frac{17}{21}\cdot\frac{52}{53}+\frac{52}{53}\cdot\frac{4}{21}\)
\(=\frac{52}{53}\left(\frac{17}{21}+\frac{4}{21}\right)\)
\(=\frac{52}{53}\cdot1\)
\(\frac{17}{21}.\frac{48}{53}+\frac{17}{21}.\frac{4}{53}+\frac{52}{53}.\frac{4}{21}\)
= \(\frac{17}{21}.\left(\frac{48}{53}+\frac{4}{53}\right)+\frac{52}{53}.\frac{4}{21}\)
= \(\frac{17}{21}.\frac{52}{53}+\frac{52}{53}.\frac{4}{21}\)
=\(\frac{52}{53}.\left(\frac{17}{21}+\frac{4}{21}\right)\)
= \(\frac{52}{53}\)