Bài 1 :
a) 9 -\(\frac{13}{4}\) + \(\frac{4}{3}\) : 2
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a) \(\left(4\frac{1}{9}+3\frac{1}{4}\right)\cdot2\frac{1}{4}+2\frac{3}{4}\)
\(=7\frac{13}{36}\cdot2\frac{1}{4}+2\frac{3}{4}\)
\(=16\frac{9}{16}+2\frac{3}{4}\)
\(=19\frac{5}{16}\)
b)\(1+\left(\frac{9}{10}-\frac{4}{5}\right)\div3\frac{1}{6}\)
\(=1+\frac{1}{10}\div\frac{19}{6}\)
\(=1+\frac{3}{95}=1\frac{3}{95}\)
MK LÀM CHO BẠN 2 Ý THÔI NHA.
K MK NHA. CHÚC BN HỌC TỐT. ^_^
c) \(\left(-7+|13|\right)-\left(13-|-7|-25\right)-\left(25-|-10|-9\right)\)
\(=-7+13-13+7+25-25+10+9\)
\(=\left(-7+7\right)+\left(13-13\right)+\left(25-25\right)+10+9\)
\(=0+0+0+10+9=10+9=19\)
MK LÀM XONG RỒI. K MK NHA. KB
a ) \(\frac{5}{7}.\frac{-7}{9}-\frac{5}{7}.\frac{2}{9}-\frac{5}{9}\)
\(\left(\frac{1}{4}-x\right)\left(x+\frac{2}{5}\right)=0\)
Ta xét 2 trường hợp
\(\begin{cases}\frac{1}{4}-x=0\\x+\frac{2}{5}=0\end{cases}\Rightarrow\orbr{\begin{cases}x=\frac{1}{4}\\x=-\frac{2}{5}\end{cases}}\)
tớ mới làm bài 1 thôi bài 2 3 tớ ko có thời gian
A) 9 - 13/4 + 4/3 : 2
=9 - 13/4 + 2/3
=9 - 47/12
=61/12
B) 13/14 : X + 4/5 = 9
13/4 :X = 9 - 4/5
13/4 : X = 41/5
X=13/4 : 41/5
X=65/164
Bai 1.
a) 9 - 13/4 +4/3 : 2
= 9 - 13/4 +4/3 x 1/2
= 9 - 13/4 + 2/3
= 36/4 - 13/4 + 2/3
= 23/4 + 2/3
= 69/12 + 8/12
= 77/12
Bai 2. Tim x
13/4 : x + 4/5 = 9
13/4 : x = 9 - 4/5
13/4 : x = 45/5 - 4/5
13/4 : x = 41/5
x = 13/4 : 41/5
x = 13/4 x 5/41
x = 65/164
Vay x = 65/164
1. \(\frac{5}{9}.\frac{7}{13}+\frac{5}{9}.\frac{9}{13}-\frac{5}{9}.\frac{3}{13}\)
= \(\frac{5}{9}\) .(\(\frac{7}{13}+\frac{9}{13}-\frac{3}{13}\) )
= \(\frac{5}{9}\) . 1 = \(\frac{5}{9}\)
\(a,\)\(x+\frac{4}{5.9}+\frac{4}{9.13}+\frac{4}{13.17}+...+\frac{4}{41.45}=-\frac{37}{45}\)
\(x+\left(\frac{9-5}{5.9}+\frac{13-9}{9.13}+\frac{17-13}{13.17}+...+\frac{45-41}{41.45}\right)=-\frac{37}{45}\)
\(x+\left(\frac{1}{5}-\frac{1}{9}+\frac{1}{9}-\frac{1}{13}+\frac{1}{13}-\frac{1}{17}+....+\frac{1}{41}-\frac{1}{45}\right)-\frac{37}{45}\)
\(x+\left(\frac{1}{5}-\frac{1}{45}\right)=-\frac{37}{45}\)
\(x+\frac{8}{45}=-\frac{37}{45}\)
\(x=-\frac{37}{45}-\frac{8}{45}\)
\(x=-1\)
=\(\frac{23}{4}+\frac{2}{3}\)
\(9-\frac{13}{4}+\frac{4}{3}\div2=\frac{36}{4}-\frac{13}{4}+\frac{4}{3}\times\frac{1}{2}\)
\(=\frac{23}{4}+\frac{2}{3}\)
\(=\frac{77}{12}\)