1/9.2/145-13/3.2/145+2/145
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19 tháng 9 2020
a) \(\frac{3}{2}.\frac{7}{2}+\frac{5}{3}.\frac{1}{2}=\frac{21}{2}+\frac{5}{6}=\frac{63}{6}+\frac{5}{6}=\frac{68}{6}=\frac{34}{3}\)
b) \(\frac{1}{9}.\frac{2}{145}-\frac{13}{3}.\frac{2}{145}+\frac{2}{145}=\frac{2}{145}\left(\frac{1}{9}-\frac{39}{9}+\frac{9}{9}\right)=\frac{2}{145}\left(-29\right)=-0.4\)
c) \(\left(-\frac{91}{12}\right):\frac{15}{7}-\frac{1}{18}:\frac{15}{7}+\frac{20}{9}:\frac{15}{7}=\frac{7}{15}\left(-\frac{91}{12}-\frac{1}{18}+\frac{20}{9}\right)=\frac{7}{15}\left(-\frac{65}{12}\right)=-\frac{91}{36}\)
HN
0
LH
3
O
14 tháng 7 2016
xin lỗi nha
\(=\frac{2}{145}\left(\frac{1}{9}+1\right)-\frac{13}{3}.\frac{1}{145}\)
\(=\frac{2}{145}.\frac{10}{9}-\frac{13}{3}.\frac{1}{145}\)
\(=\frac{1}{145}+\frac{1}{145}.\frac{10}{9}-\frac{13}{3}.\frac{1}{145}\)
\(=\frac{1}{145}\left(\frac{10}{9}-\frac{13}{3}+1\right)\)
\(=\frac{1}{145}.-\frac{20}{9}\)
\(=-\frac{4}{261}\)
LH
1
14 tháng 7 2016
\(\frac{1}{9}.\frac{2}{145}-\frac{13}{3}:\frac{1}{145}+\frac{2}{145}=\frac{2}{145}\left(\frac{1}{9}+1\right)-\frac{13}{3}:\frac{1}{145}=\frac{2}{145}.\frac{10}{9}-\frac{1885}{3}=\frac{4}{216}-\frac{1885}{3}\)
\(=-\frac{33929}{54}\)
15 tháng 12 2022
1: \(=-145\cdot13+145\cdot57+57\cdot10-57\cdot145=-1315\)
2: \(=17\cdot15-17\cdot16+16\cdot17-16\cdot20=255-320=-65\)
3: \(=-38\cdot25+38\cdot4-25\cdot4+25\cdot38=13\cdot4=52\)
4: \(=23\cdot145-23\cdot17-145\cdot23+145\cdot6=479\)
5: \(=24\cdot15-24\cdot4+4\cdot24-4\cdot15=360-60=300\)
6: \(=199\left(15-17+17-5\right)=199\cdot10=1990\)
7: \(=-39\cdot5+39\cdot99+99\cdot10-99\cdot39=795\)
HP
3
8 tháng 7 2017
C1: -145.(13-57)+57.(10-145)
=-145.(-44)+57.-135
=6380+(-7695)
=-1315
C2:SGK
NT
0
\(\dfrac{1}{9}.\dfrac{2}{145}-\dfrac{13}{3}.\dfrac{2}{145}+\dfrac{2}{145}\)
\(=\dfrac{2}{145}.\left(\dfrac{1}{9}-\dfrac{13}{3}+1\right)\)
\(=\dfrac{2}{145}.\left(\dfrac{1}{9}-\dfrac{13}{3}+\dfrac{9}{9}\right)\)
\(=\dfrac{2}{145}.\left(-\dfrac{29}{9}\right)\)\(=-\dfrac{2}{45}\)