bài 1:tính
a).7/15+4/5
b).1/16:11/16
ai làm đầy đủ phép tính mình tick 2
giúp mình đi @@
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\(\frac{4}{5}\)+ \(\frac{1}{5}\): \(\frac{-2}{15}\)= \(\frac{4}{5}\)+ \(\frac{1}{5}\)* \(\frac{-15}{2}\)=\(\frac{4}{5}\) + \(\frac{-3}{2}\)= \(\frac{-7}{10}\)
b = \(\frac{-7}{12}\). (\(\frac{3}{11}\)+ \(\frac{-14}{11}\)) + \(\frac{5}{6}\)= \(\frac{-7}{12}\). (-1) + \(\frac{5}{6}\)= \(\frac{7}{12}\)+ \(\frac{10}{12}\)= \(\frac{17}{12}\)
a)
= 8/22 + 5/22
= 11/22
= 1/2
b)
= 24/8 - 3/8
= 21/8
c)
= 45/25
= 9/5
d)
= 3/7 x 1/4
= 3/28
:)
Bài 1 phần D
Bài 2:
\(\frac{1}{4}\)x\(\frac{5}{3}\):\(\frac{2}{7}\)
= \(\frac{5}{12}\): \(\frac{2}{7}\)
=\(\frac{35}{24}\)
k mình nhá, thanks !!!
#)Trả lời :
a) \(\frac{-1}{2}+\frac{2}{7}-\frac{5}{28}\)
\(=\frac{-3}{14}-\frac{5}{28}\)
\(=\frac{-11}{28}\)
b) \(5\frac{3}{4}+\left(\frac{1}{9}-1\frac{3}{4}\right)\)
\(=\left(5\frac{3}{4}-1\frac{3}{4}\right)+\frac{1}{9}\)
\(=4+\frac{1}{9}\)
\(=4\frac{1}{9}=\frac{37}{9}\)
c) \(\frac{-5}{7}x\frac{2}{11}+\frac{-5}{7}x\frac{9}{11}+3\frac{5}{7}\)
\(=\frac{-5}{7}x\left(\frac{2}{11}+\frac{9}{11}\right)+3\frac{5}{7}\)
\(=\frac{-5}{7}x1+3\frac{5}{7}\)
\(=\frac{-5}{7}+3\frac{5}{7}\)
\(=\frac{-5}{7}+\frac{26}{7}\)
\(=\frac{21}{7}=3\)
#~Will~be~Pens~#
a) \(\frac{4}{7}:\frac{8}{11}=\frac{4}{7}\times\frac{11}{8}\)
\(=\frac{44}{56}=\frac{22}{23}\)
b) \(\frac{3}{5}+\frac{4}{5}:\frac{2}{5}=\frac{3}{5}+\frac{4}{5}\times\frac{5}{2}\)
\(=\frac{3}{5}+2\)
\(=\frac{13}{5}\)
a: 4/7:8/11=4/7x11/8=44/56=11/14
b: 3/5+4/5:2/5
= 3/5+4/5x5/2
= 3/5+10/5
=13/5
a, 13/6+5/8 : -3/4 - 7/12.4
= 13/6 + -5/6-7/3
=8/6-7/3
= -6/6
= -1
b, ( 73/5 - 21/3) + ( 4/3-43/5 )
= 73/5-21/3+4/3-43/5
=( 73/5-43/5)-(21/3-4/3)
= 6-17/3
=1/3
c, 7/5.4/9 +7/5: 9/16- 14/10.2/9
= 7/5.4/9 +7/5.16/9 - 14/45
=7/5.(4/9+16/9)-14/45
=7/5.20/9-14/45
= 140/45 - 14/45
= 126/45
Xong rùi nè! Nhưng bạn kiểm tra lại giùm nhé vì làm vào ban đêm nên hơi bất tiện
Bài 2 :
a) Tìm x
\(x:\frac{2}{3}=\frac{1}{2}\)
\(x=\frac{1}{2}\times\frac{2}{3}\)
\(x=\frac{1}{3}\)
Vậy \(x=\frac{1}{3}\)
b) Tính giá trị của biểu thức :
\(\frac{5}{7}\times\frac{3}{5}-\frac{10}{14}\times\frac{2}{15}\)
\(=\frac{5}{7}\times\frac{3}{5}-\frac{5}{7}\times\frac{2}{15}\)
\(=\frac{5}{7}\times\left(\frac{3}{5}-\frac{2}{15}\right)\)
\(=\frac{5}{7}\times\frac{7}{15}\)
\(=\frac{1}{3}\)
ủng hộ tớ nha.
Bài 2:
a) x : 2/3 = 1/2
x = 1/2 x 2/3
x = 1/3
b) 5/7 x 3/5 - 10/14 x 2/15
= 3/7 - 5/7 x 2/15
= 3/7 - 2/21 (tự quy đồng)
= 1/3
\(\frac{6}{11}\cdot\frac{3}{14}+\frac{-5}{16}+\frac{3}{14}\cdot\frac{5}{11}+\frac{-3}{16}\)
\(=\frac{6}{11}\cdot\frac{3}{14}+\frac{3}{14}\cdot\frac{5}{11}+\frac{-5}{16}+\frac{-3}{16}\)
\(=\frac{3}{14}\cdot\left(\frac{6}{11}+\frac{5}{11}\right)+\left(\frac{-5}{16}+\frac{-3}{16}\right)\)
\(=\frac{3}{14}\cdot\frac{6+5}{11}+\frac{-5+\left(-3\right)}{16}\)
\(=\frac{3}{14}\cdot\frac{11}{11}+\frac{-8}{16}\)
\(=\frac{3}{14}\cdot1+\frac{-1}{2}\)
\(=\frac{3}{14}+\frac{-1}{2}\)
\(=\frac{3}{14}+\frac{-7}{14}\)
\(=\frac{3+\left(-7\right)}{14}\)\(=\frac{-4}{14}=\frac{-2}{7}\)
\(\frac{-5}{6}+\left(7x-\frac{1}{2}\right)\cdot\frac{2}{9}=-1\frac{1}{3}\)
\(\frac{-5}{6}+\frac{14}{9}\cdot x-\frac{1}{9}=-\frac{4}{3}\)
\(\frac{14}{9}\cdot x-\frac{1}{9}=-\frac{4}{3}+\frac{5}{6}\)
\(\frac{14}{9}\cdot x-\frac{1}{9}=-\frac{1}{2}\)
\(\frac{14}{9}\cdot x=-\frac{1}{2}+\frac{1}{9}\)
\(\frac{14}{9}\cdot x=-\frac{7}{18}\)
\(x=-\frac{7}{18}:\frac{14}{9}\)
\(x=-\frac{1}{4}\)
a) \(5+\frac{1}{4}=\frac{20}{4}+\frac{1}{4}=\frac{21}{4}\)
b) \(7-\frac{3}{5}=\frac{35}{5}-\frac{3}{5}=\frac{32}{5}\)
b) \(2\times\frac{9}{11}=\frac{18}{11}\)
d) \(\frac{2}{34}:5=\frac{2}{34}:\frac{5}{1}=\frac{2}{34}\times\frac{1}{5}=\frac{2}{170}=\frac{1}{85}\)
ủng hộ nha.
Năn nỉ dữ quá :))
a) 7/15 + 4/5
= 7/15 + 12/15
= 19/15
b) 1/16 : 11/16
= 1/16 x 16/11
= 1/11
a)=\(\frac{7}{15}\)+\(\frac{12}{15}\)=\(\frac{19}{15}\)
b)\(\frac{1}{16}\)x\(\frac{16}{11}\)=\(\frac{1x16}{16x11}\)=\(\frac{1}{11}\)
tk đi