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a) 2/5 + 1/2 + 7/10
= 4/10 + 5/10 + 7/10
= 9/10 + 7/10
= 16/10 = 8/5
b) 4/9 + 11/8 - 5/6
= 32/72 + 99/72 - 60/72
= 191/72
c) 9/20 - 8/15 x 5/12
= 9/20 - 2/9
= 41/180
d) 2/3 : 4/5 : 7/12
= 5/6 : 7/12
= 10/7
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
a ) \(\frac{3}{4}\)+ \(\frac{1}{6}\) = \(\frac{18}{24}\)+ \(\frac{4}{24}\)= \(\frac{22}{24}\)
b ) \(\frac{11}{12}\)- \(\frac{3}{4}\)= \(\frac{11}{12}\)- \(\frac{9}{12}\)= \(\frac{2}{12}\)
c ) \(\frac{11}{12}\)- \(\frac{1}{6}\) = \(\frac{11}{12}\)- \(\frac{2}{12}\) = \(\frac{9}{12}\)
d ) \(\frac{1}{6}\)+ \(\frac{3}{4}\)= \(\frac{4}{24}\)+ \(\frac{18}{24}\) = \(\frac{22}{24}\)
Xin lỗi mình không rút gọn nha !
1a) \(\frac{12}{17}+\frac{19}{17}+\frac{8}{17}\)
\(=\left(\frac{12}{17}+\frac{8}{17}\right)+\frac{19}{17}\)
\(=\frac{20}{17}+\frac{19}{17}\)
\(=\frac{39}{17}\)
b) \(\frac{2}{5}+\frac{7}{12}+\frac{13}{12}\)
\(=\frac{2}{5}+\frac{5}{3}\)
\(=\frac{31}{15}\)
2) \(\frac{25}{3}-x=\frac{5}{6}\)
\(x=\frac{25}{3}-\frac{5}{6}\)
\(x=\frac{45}{6}\)
ủng hộ tớ nha
Mik xin lỗi nha dấu_ mình định ghi là + nha
( 48 x 5 + 48 x 7 - 48 x 12 )
=48 x ( 5 + 7 - 12 )
=48 x 0
= 0
\(\Rightarrow\)( 48 x 5 + 48 x 7 - 48 x 12 ) : ( 1 + 3 + 5 + 7 +.....+ 91 ) = 0
Hk tốt
\(\left(48\text{ x }5+48\text{ x }7-48\text{ x }12\right)\text{ : }\left(1+3+5+7+...+91\right)\)
\(=\left(48\text{ x }5+48\text{ x }7-48\text{ x }12\right)\text{ : }A\)
\(=48\text{ x }\left(5+7-12\right)\text{ : }A\)
\(=48\text{ x }\left(12-12\right)\text{ : }A\)
\(=48\text{ x }0\text{ : }A\)
\(=0\text{ : }A\)
\(=0\)
1/3 + 5/12 = 4/12 + 5/12 = 9/12 = 3/4
9/12 - 1/3 = 9/12 - 4/12 = 5/12
9/12 - 5/12 = 4/12 = 1/3
5/12 + 1/3 = 5/12 + 4/12 = 9/12 = 3/4
Làm đầy đủ rồi đó
1/3 + 5/12 = 3/4
9/12 - 1/3 = 5/12
9/12 - 5/ 12 = 1/3
5/12 + 1/3 = 3/4