tinh
M=9/40-11/60+13/84-15/112
(giai bang cach thuan tien)
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\(\frac{4}{15}+\frac{8}{13}+\frac{11}{15}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=\frac{15}{15}+\frac{13}{13}\)
\(=1+1\)
\(=2\)
Chúc bạn học tốt nha !!!
\(\frac{4}{15}+\frac{8}{13}+\frac{11}{15}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=1+1\)
\(=2\)
M = \(\frac{9}{40}\)- \(\frac{11}{60}\)+\(\frac{13}{84}\)- \(\frac{15}{112}\)
M = 378/1680 - 308/1680+ 260/1680- 225/1680
M = 105/1680
\(\frac{9}{40}-\frac{11}{60}+\frac{13}{84}-\frac{15}{112}=\frac{27}{120}-\frac{22}{120}+\frac{13}{84}-\frac{15}{112}=\frac{1}{24}+\frac{13}{84}-\frac{15}{112}=\frac{7}{168}+\frac{26}{168}-\frac{15}{112}=\frac{11}{56}-\frac{15}{112}=\frac{22}{112}-\frac{15}{112}=\frac{7}{112}=\frac{1}{16}\)
a) 3/5x7/9+11/9x3/5
=3/5 x(7/9+11/9)
= 3/5x2
=6/5
b)14/13:1/2+3/13x2-2x7/13
= 14/13 x 2 +3/13 x2 - 2x7/13
=2 x (14/13 +3/13 -7/13)
= 2 x 10/13
= 20/13
a) 3/5 x 7/9 + 11/9 x 3/5 - 3/10
= 3/5 x 7/9 + 11/9 x 3/5 - 3/5 x 2
= 3/5 x ( 7/9 + 11/9 - 2 )
= 3/5 x 0
= 0
b) 14/13 : 1/2 + 3/13 x 2 - 2 x 7/13
= 14/13 x 2/1 + 3/13 x 2 - 2 x 7/13
= ( 14/13 + 3/13 - 7/13 ) x 2
= 10/13 x 2 = 20/13
=\(\frac{19}{11}+\frac{3}{11}+\frac{8}{13}\)
=\(2+\frac{8}{13}\)
=\(2\frac{8}{13}\)