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a; - \(\dfrac{10}{13}\) + \(\dfrac{5}{17}\) - \(\dfrac{3}{13}\) + \(\dfrac{12}{17}\) - \(\dfrac{11}{20}\)
= - (\(\dfrac{10}{13}\) + \(\dfrac{3}{13}\)) + (\(\dfrac{5}{17}\) + \(\dfrac{12}{17}\)) - \(\dfrac{11}{20}\)
= - 1 + 1 - \(\dfrac{11}{20}\)
= 0 - \(\dfrac{11}{20}\)
= - \(\dfrac{11}{20}\)
b; \(\dfrac{3}{4}\) + \(\dfrac{-5}{6}\) - \(\dfrac{11}{-12}\)
= \(\dfrac{9}{12}\) - \(\dfrac{10}{12}\) + \(\dfrac{11}{12}\)
= \(\dfrac{10}{12}\)
= \(\dfrac{5}{6}\)
c; [13.\(\dfrac{4}{9}\) + 2.\(\dfrac{1}{9}\)] - 3.\(\dfrac{4}{9}\)
= [\(\dfrac{52}{9}\) + \(\dfrac{2}{9}\)] - \(\dfrac{4}{3}\)
= \(\dfrac{54}{9}\) - \(\dfrac{4}{3}\)
= \(\dfrac{14}{3}\)
=(1+2-3)-(4-5-6+7)-(8-9-10+11)-...-(296-297-298+299)-300+301+302
= 0 - 0 - 0 -...- 0 - (-303)
= 303
213 . 45 . 82=213.(22)5.(23)2=213.210.26=213+10+6=219
1006 . 10004 . 100003=(102)6.(103)4.(104)3=1012.1012.1012=1012+12+12=1036
36 9 : 189=(36:18)9=29
245 : 65 . 88=(24:6)5.88=45.88=(22)5.(23)8=210.224=210+24=234
515 . 1253 : 625=515.(53)3.54=515.59.54=515+9+4=528
282014 : 72014 : 60=(28:7)2014 : 1=42014:1=42014
24 . 55 + 52 . 53=24.55+52+3=24.55+55=(24+1).55=25.55=52.55=52+5=57
7 . 39 + 310 + 51 . 38=7.3.38 + 32.38 + 51 . 38=21.38 + 9.38 + 51 . 38=(21+9+51).38=81.38=34.38=34+8=312
a, 13/6+5/8 : -3/4 - 7/12.4
= 13/6 + -5/6-7/3
=8/6-7/3
= -6/6
= -1
b, ( 73/5 - 21/3) + ( 4/3-43/5 )
= 73/5-21/3+4/3-43/5
=( 73/5-43/5)-(21/3-4/3)
= 6-17/3
=1/3
c, 7/5.4/9 +7/5: 9/16- 14/10.2/9
= 7/5.4/9 +7/5.16/9 - 14/45
=7/5.(4/9+16/9)-14/45
=7/5.20/9-14/45
= 140/45 - 14/45
= 126/45
Xong rùi nè! Nhưng bạn kiểm tra lại giùm nhé vì làm vào ban đêm nên hơi bất tiện
=7/6*2/14
=7/6*1/7
=1/6
b: \(=\left(\dfrac{-3}{4}\cdot\dfrac{-4}{3}\right)\cdot\dfrac{12}{7}=\dfrac{12}{7}\)
c: \(=-\dfrac{9}{5}\cdot\dfrac{5}{2}\cdot\dfrac{2}{5}=\dfrac{-9}{5}\)