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21 x 25,36 + 25,36 x 80 - 25,36
= 21 x 25,36 + 25,36 x 80 - 25,36 x 1
= 25,36 x ( 21 + 80 - 1 )
= 25,36 x 100
= 2536
/HT\
21 x 25,36 + 25,36 x 80 - 25,36
=21 x 25,36 + 25,36 x 80 - 25,36 x 1
=25,36 x (21 + 80 -1)
= 25,36 x 100
2536
1a) \(\frac{10}{11}:\frac{11}{3}=\frac{10}{11}.\frac{3}{11}=\frac{30}{121}\)
b) \(3,42:0,75.8,4-6,8\)
\(=4,56.8,4-6,8=38,304-6,8=31,504\)
2a) \(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}=\frac{21.22.68}{11.17.63}=\frac{7.3.2.11.17.4}{11.17.3.3.7}=\frac{2.4}{3}=\frac{8}{3}\)
b) \(\frac{5}{14}.\frac{7}{13}.\frac{26}{25}=\frac{5.7.26}{14.13.25}=\frac{5.7.13.2}{2.7.13.5.5}=\frac{1}{5}\)
\(\frac{10}{11}:1\frac{1}{3}\)
\(=\frac{10}{11}:\frac{4}{3}\)
\(=\frac{10}{11}\cdot\frac{3}{4}\)
\(=\frac{15}{22}\)
\(3,42:0,57\cdot8,4-6,8\)
\(=6\cdot8,4-6,8\)
\(=50,4-6,8\)
\(43,6\)
2.
\(\frac{21}{11}\cdot\frac{22}{17}\cdot\frac{68}{63}\)
\(=\frac{21\cdot22\cdot68}{11\cdot17\cdot63}\)
\(=\frac{21\cdot11\cdot2\cdot17\cdot4}{11\cdot17\cdot21\cdot3}\)
\(=\frac{̸21\cdot̸11\cdot2\cdot̸17\cdot4}{̸11\cdot̸17\cdot̸21\cdot3}\)
\(=\frac{8}{3}\)
\(\frac{5}{14}\cdot\frac{7}{13}\cdot\frac{26}{25}\)
\(=\frac{5\cdot7\cdot26}{14\cdot13\cdot25}\)
\(=\frac{̸5\cdot̸7\cdot̸13\cdot2}{̸7\cdot2\cdot̸13\cdot̸5\cdot5}\)
\(=\frac{2}{10}\)
3,42 : 0,2 + 3,42 : 0,5 + 3,42 : 0,25 - 3,42
=3,42 : \(\frac{1}{5}\) + 3,42 : \(\frac{1}{2}\) + 3,42 : \(\frac{1}{4}\) - 3,42
=3,42 x 5 + 3,42 x 2 + 3,42 x 4 - 3,42
=3,42 x (5+2+4-1)
=3,42 x 10
=34,2
Học tốt
(25,36 : 0,5 + 25,36 : 0,25 + 25,36 : 0,125)
= 25,36 : (0,5 + 0,25 + 0,125)
= 25,36 : 0,875
= 28,9828...
\(25,36:0,5+25,36:0,25+25,36:0,125\)
\(\Rightarrow\)\(25,36:\left(0,5+0,25\right)+25,36:0,125\)
\(\Rightarrow25,36:0,75+25,36:0,125\)
\(\Rightarrow25,36:\left(0,75+0,125\right)\)
\(\Rightarrow25,36:0,875\)
...........