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\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}=\left(\frac{7}{12}+\frac{1}{12}\right)-\frac{2}{7}=\frac{2}{3}-\frac{2}{7}=\frac{14}{21}-\frac{6}{21}=\frac{8}{21}\)
\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}\)
\(=\left(\frac{7}{12}+\frac{1}{12}\right)-\frac{2}{7}\)
\(=\frac{8}{12}-\frac{2}{7}\)
\(=\frac{2}{3}-\frac{2}{7}\)
\(=\frac{14}{21}-\frac{6}{21}\)
\(=\frac{8}{21}\)
\(83,45-30,98-42,27\)
\(=83,45-\left(30,98+42,27\right)\)
\(=83,45-73,25\)
\(=10,2\)
Chúc bạn học tốt !!!
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
1 Tính
7/12 - 2/7 + 1/12= (7/12-1/12)+2/7=6/12+2/7=1/2+2/7=7/14+4/14=11/14
12/17-5/17-4/17= 12-5-4/17=3/17
2a, 7/11+3/4+4/11+1/4= (7/11+4/11)+3/4+1/4=11/11+4/4=1+1=2
b)72/99-28/99-14/99= (72-28-14)/99=30/99=10/33
c)69,78+35,97+30,22= (69,78+30,22)+35,97=100+35,97=135,97
d) 83,45-30,98-42,47=83,45-(30,98+42,47)=83,45-73,45=10
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