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1/2+2/3+3/4+4/5+5/6+6/7+7/8+8/9+9/1
triệt tiêu còn:1/1
last đáp án:1/1
\(\frac{2}{5}+1=\frac{2+5}{5}=\frac{7}{5}\)
\(\frac{6}{7}.4=\frac{6.4}{7}=\frac{24}{7}\)
\(\frac{3}{7}:2=\frac{3}{7.2}=\frac{3}{14}\)
\(2:\frac{2}{4}=\frac{2.4}{2}=4\)
\(\frac{3}{4}.\frac{2}{9}+\frac{1}{3}=\frac{6}{36}+\frac{1}{3}=\frac{1}{6}+\frac{1}{3}=\frac{1}{2}\)
\(\frac{1}{4}:\frac{1}{3}-\frac{1}{2}=\frac{3}{4}-\frac{1}{2}=\frac{1}{4}\)
2/5 + 1 = 7/5
6/7 x 4 =24 /7
3/7 :2 =1/7
2:2/4 = 4
3/4 x 2/9 + 1/3 = 1/2
1/4 : 1/3 - 1/2 = 1/4
a] 4/12 ; 5/12 ; 11/2 ; 1/4
b] 1 ; 9/12; 12/5 ; 11/3
c] 8/21; 6/11;8/7
d] 2/3 ;2/7 15/2
a]1/3 5/12 11/2 1/4
b]1 3/4 12/5 33/9
c]8/21 6/11 8/7
d]2/3 2/7 15/2
\(\frac{2}{5}+\frac{5}{6}=\frac{12}{30}+\frac{25}{30}=\frac{37}{30}\)
\(4-2\frac{1}{3}=\frac{4\times3-2\times3+1}{3}=\frac{5}{3}\)
\(\frac{4}{7}+\frac{1}{4}:\frac{2}{3}=\frac{4}{7}+\frac{1}{4}\times\frac{2}{3}=\frac{4}{7}+\frac{1}{6}=\frac{24}{42}+\frac{7}{42}=\frac{31}{42}\)
\(\frac{3}{4}:\frac{2}{3}\times\frac{8}{9}=\frac{3}{4}\times\frac{3}{2}\times\frac{8}{9}=\frac{9}{8}\times\frac{8}{9}=1\)
2/5+5/6=37/30
4-2 1/3=5/3
4/7+1/4:2/3=4/7+3/8=53/56
3/4:2/3 nhan 8/9=9/8 nhan 8/9=1