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a)=(3/8+10/16)+(7/12+10/24)
=1+1=2
c)=(4/6+14/6)+(7/13+19/13)+(17/9+1/9)
=3+2+2=7
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10=55
2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20=110
1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19=100
k mk nha pạn hiền!
10 +1 = 11 có 10 số vậy thì 10 : 2 = 5 thì sẽ bằng 5x11 = 55
2 + 20 = 22 cũng có 10 số lấy 10 : 2 = 5 se bang 22 x5 = 110
1+19 = 20 , 10 : 2 = 5 , 20x5 = 100
* \(10-\frac{9}{16}+\frac{8}{2}\)
\(=\frac{160}{16}-\frac{9}{16}=\frac{160-9}{16}=\frac{151}{16}+\frac{8}{2}\)
\(=\frac{151}{16}+\frac{64}{16}=\frac{151+64}{16}=\frac{215}{16}\)
* \(\frac{12}{27}-\frac{5}{3}\times\frac{7}{3}\)
\(=\frac{12}{27}-\frac{35}{9}\)
\(=\frac{12}{27}-\frac{105}{27}=\frac{12-105}{27}=\frac{-93}{27}=\frac{-31}{9}\)
Đúng nha.
\(\frac{7}{8}>\frac{7}{9}>\frac{7}{10}>\frac{7}{11}>\frac{7}{15}\)
Tính :
\(a,\frac{1}{4}+\frac{3}{8}+\frac{5}{16}=\frac{4+6+5}{16}=\frac{15}{16}\)
\(b,\frac{3}{5}-\frac{1}{3}-\frac{1}{6}=\frac{18-10-5}{30}=\frac{3}{30}=\frac{1}{10}\)
\(c,\frac{4}{7}\times\frac{5}{8}\times\frac{7}{12}=\frac{5}{14}\times\frac{7}{12}=\frac{5}{24}\)
\(d,\frac{25}{28}:\frac{15}{14}\times\frac{6}{7}=\frac{25\times14\times6}{28\times15\times7}=\frac{5}{7}\)
1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+9+8+9+10+12+13+14+15+16+17+18+19+20+30+1000000=10000274
a; \(\dfrac{1}{4}\) + \(\dfrac{2}{5}\) + \(\dfrac{6}{8}\) + \(\dfrac{9}{15}\) + \(\dfrac{8}{1}\)
= (\(\dfrac{1}{4}\) + \(\dfrac{6}{8}\)) + (\(\dfrac{2}{5}\) + \(\dfrac{9}{15}\)) + \(\dfrac{8}{1}\)
= (\(\dfrac{1}{4}\) + \(\dfrac{3}{4}\)) + (\(\dfrac{2}{5}\) + \(\dfrac{3}{5}\)) + 8
= 1 + 1 + 8
= 2 + 8
= 10
b; \(\dfrac{1}{2}\) + \(\dfrac{2}{4}\) + \(\dfrac{3}{6}\) + \(\dfrac{4}{8}\) + \(\dfrac{5}{10}\) + \(\dfrac{6}{12}\) + \(\dfrac{7}{14}\) + \(\dfrac{8}{16}\) + \(\dfrac{10}{20}\)
= \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\) x (\(\dfrac{2}{2}\) + \(\dfrac{3}{3}\) + \(\dfrac{4}{4}\) + \(\dfrac{5}{5}\)+ \(\dfrac{6}{6}+\dfrac{7}{7}+\dfrac{8}{8}\) + \(\dfrac{10}{10}\))
= \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\) x (1 + 1 +1 + 1+ 1+ 1+ 1 +1)
= \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\) x 1 x 8
= \(\dfrac{1}{2}\) + \(\)\(\dfrac{1}{2}\) x 8
= \(\dfrac{1}{2}\) + 4
= \(\dfrac{9}{2}\)
\(16:\frac{7}{10}=\frac{3}{5}.x-8-9\)
Bạn ơi dấu chấm là thay cho dấu nhân nhé
Lên lớp 6 bạn sẽ được học về điều đó
\(\frac{160}{7}+17=\frac{3}{5}.x\)
\(\frac{160}{7}+\frac{119}{7}=\frac{3}{5}.x\)
\(x=\frac{279}{7}:\frac{3}{5}\)
\(x=\frac{465}{7}\)
Hội con 🐄chúc bạn học tốt!!!
\(16:\left(\frac{3}{5}.x+8+9\right)=\frac{7}{10}\)
\(\Leftrightarrow16:\left(\frac{3}{5}.x+17\right)=\frac{7}{10}\)
\(\Leftrightarrow\frac{3}{5}x+17=\frac{7}{10}.\frac{1}{16}\)
\(\Leftrightarrow\frac{3}{5}x+17=\frac{7}{160}\)
\(\Leftrightarrow\frac{3}{5}x=\frac{7}{160}-17\)
\(\Leftrightarrow\frac{3}{5}x=-\frac{2713}{160}\)
\(\Leftrightarrow x=-\frac{2713}{160}.\frac{5}{3}\)
\(\Leftrightarrow x=\frac{2713}{96}\)
Vậy .....
HÃY TRAO CHO MÌNH CÁI :))