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a) \(\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}\)
\(=1-\frac{1}{4}\)
\(=\frac{3}{4}\)
b) \(\frac{4}{7}\times\frac{8}{9}+\frac{4}{7}\times\frac{1}{9}\)
\(=\frac{4}{7}\times\left(\frac{8}{9}+\frac{1}{9}\right)\)
\(=\frac{4}{7}\times1\)
\(=\frac{4}{7}\)
c) \(\frac{13}{6}\times\frac{3}{8}-\frac{3}{8}\times\frac{7}{6}\)
\(=\frac{3}{8}\times\left(\frac{13}{6}-\frac{7}{6}\right)\)
\(=\frac{3}{8}\times1\)
\(=\frac{3}{8}\)
d) \(\frac{1}{1x2}+\frac{1}{2x3}+\frac{1}{3x4}+...+\frac{1}{9x10}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{9}-\frac{1}{10}\)
\(=1-\frac{1}{10}\)
\(=\frac{9}{10}\)
a) 12/15 rút gọn cho 3 bằng 4/5
b) 20/15 rút gọn cho 5 bằng 4/3
c)36/24 rút gon cho 6 bằng 6/4 lại rút gọn tiếp cho 2 bằng 3/2
d) 2/4 rút gọn cho 2 bằng 1/ 2
e) 6/8 rút gọn cho 2 bằng 3/4
g) 4/10 rút gọn cho 2 bằng 2/ 5 .
Đáp án là như vậy k cho mình nha !!!
a)3/4 x 2/9 + 1/3
=1/6 + 1/3
=1/6 + 2/6
=1/2
b)5/4:2.9+1/2
=1.25 : 2.9 + 1/2
=25/58 + 1/2 =27/29
c)7/2 - 1/4 x 1/5
=7/2 - 1/20
=69/20
d)5/4+1/5:2/3
=5/4 + 3/10
=31/20
Học tốt!
Bn làm nhân chia trước cộng trừ sau nhé.
áp dụng công thức bn nhé
chúc bn hộc tốt
a=28/15
b=22/15
c=2/3
d=6
k hộ cái nha
a)28/15
b)22/15
c)2/3
d)6
a)=28/15
b)=22/15
c)=2/3
d)=6
4/3 + 1/3 + 1/5 = ( 4/3 + 1/3 ) + 1/5
= 5/3 + 1/5 = 28/15
b) 4/3 + 1/3 - 1/5 = 22/15
c) 1/2 x 1/3 : 1/4 = 2/3
d ) 1/2 : 1.3 : 1/4 = 6
k minh di ma
a) \(\frac{4}{3}+\frac{1}{3}+\frac{1}{5}=\frac{5}{3}+\frac{1}{5}\)\(=\)\(1\frac{13}{15}\)
b) \(\frac{4}{3}+\frac{1}{3}-\frac{1}{5}=\frac{5}{3}-\frac{1}{5}=1\frac{7}{15}\)
c)\(\frac{1}{2}.\frac{1}{3}:\frac{1}{4}=\frac{1}{2}.\frac{1}{3}.\frac{4}{1}=\frac{2}{3}\)
d) \(\frac{1}{2}:\frac{1}{3}:\frac{1}{4}=\frac{1}{2}.3.4=6\)
a) 4/3 + 1/3 + 1/5 = 5/3 + 1/5= 25/15 +3/15 = 28/15
b) 4/3 + 1/3 - 1/5 = 5/3 - 1/5= 25/15 - 3/15 = 22/15
c) 1/2 x 1/3 : 1/4 = 1/6 : 1/4 = 1/6 x 4 = 4/6= 2/3
d) 1/2 : 1/3 : 1/4 = 1/2 x3 = 3/2 : 1/4 = 3/2 x 4 = 6
\(\frac{4}{3}+\frac{1}{3}+\frac{1}{5}\)\(=\frac{5}{3}+\frac{1}{5}\)\(=\frac{28}{15}\)
\(\frac{4}{3}+\frac{1}{3}-\frac{1}{5}=\frac{5}{3}-\frac{1}{5}=\frac{22}{15}\)
\(\frac{1}{2}.\frac{1}{3}:\frac{1}{4}=\frac{1}{6}:\frac{1}{4}=\frac{2}{3}\)
\(\frac{1}{2}:\frac{1}{3}:\frac{1}{4}=\frac{3}{2}:\frac{1}{4}=\frac{3}{8}\)
a 1/13/15
b1/7/15
c2/3
d 6
a) 28/15
b) 22/15
c) 2/3
d) 6
\(\left(a\right)\frac{4}{3}+\frac{1}{3}+\frac{1}{5}=\left(\frac{4}{3}+\frac{1}{3}\right)+\frac{1}{5}=\frac{5}{3}+\frac{1}{5}=\frac{25}{15}+\frac{3}{15}=\frac{28}{15}\)\(\frac{28}{15}\)
\(\left(b\right)\frac{4}{3}+\frac{1}{3}-\frac{1}{5}=\left(\frac{4}{3}+\frac{1}{3}\right)-\frac{1}{5}=\frac{5}{3}-\frac{1}{5}=\frac{25}{15}-\frac{3}{15}=\frac{22}{15}\)
\(\left(c\right)\frac{1}{2}x\frac{1}{3}:\frac{1}{4}=\frac{1}{6}:\frac{1}{4}=\frac{2}{3}\)
\(\left(d\right)\frac{1}{2}:\frac{1}{3}:\frac{1}{4}=\left(\frac{1}{2}:\frac{1}{4}\right):\frac{1}{3}=2:\frac{1}{3}=6\)
Xin lỗi viết nhầm ở câu (a) viết thừa 1 số\(\frac{28}{15}\)
a) 28/15 b)22/15 c)2/3 d)6