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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
\(\dfrac{12}{5}+3=\dfrac{12}{5}+\dfrac{15}{5}=\dfrac{12+15}{5}=\dfrac{27}{5}\)
( 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
\(\left(48\text{ x }5+48\text{ x }7-48\text{ x }12\right)\text{ : }\left(1+3+5+7+...+91\right)\)
\(=\left(48\text{ x }5+48\text{ x }7-48\text{ x }12\right)\text{ : }A\)
\(=48\text{ x }\left(5+7-12\right)\text{ : }A\)
\(=48\text{ x }\left(12-12\right)\text{ : }A\)
\(=48\text{ x }0\text{ : }A\)
\(=0\text{ : }A\)
\(=0\)
Bài 1
\(\dfrac{1}{2}+\dfrac{7}{10}=\dfrac{5}{10}+\dfrac{7}{10}=\dfrac{12}{10}=\dfrac{6}{5}\)
\(\dfrac{8}{15}\times\dfrac{5}{12}=\dfrac{40}{180}=\dfrac{2}{9}\)
Baì 2
\(30\times\dfrac{5}{3}=50\)
\(\dfrac{6}{5}\times\dfrac{5}{3}=2\)
\(\dfrac{12}{40}\times\dfrac{5}{3}=\dfrac{1}{2}\)
a)2/5+3/10-1/2=7/10-1/2=2/10=1/5
b)8/11+8/33x3/4=8/11+2/11=10/11
c)7/9x3/14:5/8=1/6:5/8=8/30+4/15
d)5/12-7/32:21/16=5/12-1/6=3/12
nha
a) 2/5+3/10-1/2
= 4/10+3/10-5/10
= 2/10 = 1/5
b) 8/11+8/33x3/4
= 8/11+2/11
= 10/11
c) 7/9x3/14:5/8
= 1/6:5/8
= 1/6x8/5
=4/15
d) 5/12-7/32:21/16
= 5/12-7/32x16/21
= 5/12-1/6
= 5/12-2/12
= 3/12
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 !
5/12 + 1/12 - 1/4 =7/12 - 1/4 = 7/12 - 3/12 = 4/12 =1/3
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