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a) 2/5+3/4=23/20
7/12-2/7+1/12=8//21
12/17-5/17-4/17=3/17
b) 675,39+342,14=1017,53
563,87+403,13-328,35=638,65
a) 2/5+3/4
=8/20+15/20
=21/20
7/12-2/7+1/12
=7/12+1/12-2/7
=1/4-2/7
=7/28-8/28
=-1/28
12/17-5/17-4/17
=12/17-9/17
=3/17
b) 675,39+342,14
= 1017,53
563,87+403,13-328,35
= 967-328,35
= 638,65
a) 2/5 + 3/4 =8/20 + 15/20 = 23/20
7/12 - 2/7 + 1/12 = (7/12 + 1/12) - 2/7 = 8/12 - 2/7 = 2/3 - 2/7 = 14/21 - 6/21 =8/21
12/17 - 5/17 - 4/17 = 7/17 - 4/17 = 3/17
b) 675,39 + 342,14 = 1017,53
563,87 + 403,13 - 328,35 = 967 - 328,35 = 638,65
Chúc bạn học tốt
2/5 +3/4=23/20 7/12 - 2/7 +1/12=32/84 12/17 -5/17 - 4/17=3/17
675,39 + 342,14=1017,54 563,87 + 203,13 - 328,35 =438,65
a,\(\frac{2}{5}+\frac{3}{4}=\frac{8+15}{20}=\frac{23}{20}\)
\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}=(\frac{7}{12}+\frac{1}{12})-\frac{2}{7}\)
\(=\frac{2}{3}-\frac{2}{7}=\frac{14-6}{21}=\frac{8}{21}\)
\(\frac{12}{17}-\frac{5}{17}-\frac{4}{17}=\frac{7}{17}-\frac{4}{17}=\frac{3}{17}\)
b,\(675,39+342,14=1017,53\)
\(563,87+403,13-328,35=638,65\)
2/5+3/4=23/20
7/12-2/7+1/12=8/21
12/17-5/17-4/173/17
675,39+342,14=1017,53
563,87+403,13-328,35=638,65
\(\frac{2}{5}+\frac{3}{4}=\frac{8}{20}+\frac{15}{20}=\frac{23}{20}\)
\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}=\left(\frac{7}{12}+\frac{1}{12}\right)-\frac{2}{7}=\frac{2}{3}-\frac{2}{7}=\frac{8}{21}\)
\(\frac{12}{17}-\frac{5}{17}-\frac{4}{17}=\frac{12-5-4}{17}=\frac{3}{17}\)
\(675,39+342,14=1017,53\)
\(563,87+403,13-328,35=638,65\)
~Học tốt~
a) 2/5 + 3/4
= 8/20 + 15/20
= 23/20.
7/12 - 2/7 + 1/12
= ( 7/12 + 1/12 ) - 2/7
= 2/3 - 2/7
= 8/21.
12/17 - 5/17 - 4/17
= 7/17 - 4/17
= 3/17.
b) 675,39 + 342,14 = 1017,53
563,87 + 403,13 - 328,35
= 967 - 328,35
= 638,65.
K mình nhé Hoàng Phương Chi!
1.
a) 889972 + 96306 = 986278
b) 726,83 - 349,67 = 377,16
c) \(\frac{7}{8}+\frac{3}{4}=\frac{13}{8}\)
d)\(2-\frac{5}{6}=\frac{7}{6}\)
2/5 + 3/4 = 23/40
7/12 - 2/7 + 1/12 = 25/84 + 1/12 = 8/21
12/17 - 5/17 - 4/17 = 3/17
OK
\(\frac{2}{5}+\frac{3}{4}=\frac{8}{20}+\frac{15}{20}=\frac{23}{20}\)
\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}=\left(\frac{7}{12}+\frac{1}{12}\right)-\frac{2}{7}=\frac{2}{3}-\frac{2}{7}=\frac{14}{21}-\frac{6}{21}=\frac{8}{21}\)
\(\frac{12}{17}-\frac{5}{17}-\frac{4}{17}=\frac{12-5-4}{17}=\frac{3}{17}\)
a) \(\frac{2}{3}+\frac{3}{4}=\frac{8}{12}+\frac{9}{12}=\frac{17}{12}\)
\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}=\frac{7}{12}+\left(-\frac{2}{7}\right)+\frac{1}{12}=\frac{7}{12}+\frac{1}{12}+\left(-\frac{2}{7}\right)=\frac{8}{12}+\left(-\frac{2}{7}\right)=\frac{2}{3}+\left(-\frac{2}{7}\right)=-\left(\frac{14}{21}+\frac{6}{21}\right)=-\frac{20}{21}\)
\(\frac{12}{17}-\frac{5}{17}-\frac{4}{17}=\frac{12-5-4}{17}=\frac{3}{17}\)
b) 675,39 + 342,14 = 1017,53
563,87 + 403,13 = 967
a]2/3+3/4=8/12+9/12=17/12
7/12-2/7+1/12=49/84-24/84+7/84=25/84+7/84=32/84=8/21
12/17-5/17-4/7=7/17-4/17=3/17
b]675,39+342,14=999,53
563,87+403,13=967