Bài 1

245+368+155+332/25.4

=(245+155)+(368+332)/100

=400+700/100

=1100/100

=11/1=11

Bài 2

X:6+234578=20208+197356+39792+202644

X:6+234578=(20208+39792)+(197356+202644)

X:6+234578=60000+400000=460000      (bước này mk rút gọn cho dễ, nhưng trong tập thì bạn có thể làm ra từng bước nha)

X:6=460000-234578

X:6=225422

X   =225422.6

X   =1 352 532.

\(\frac{2}{6}+\frac{4}{14}+\frac{22}{12}+16+\frac{2}{9}\)

\(=\frac{1}{3}+\frac{2}{7}+\frac{11}{6}+16+\frac{2}{9}\)

\(=\frac{42}{126}+\frac{36}{126}+\frac{231}{126}+\frac{28}{126}+16\)

\(=\frac{337}{126}+16\)

\(=18\frac{85}{126}\)

chúc bạn học tốt

Đ/S = \(18\frac{85}{126}\)

Chúc bạn hk tốt!! >> NGUYỄN DIỆU HẰNG<<  

\(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{12}{15}+\frac{22}{33}+\frac{48}{64}\)

\(=\frac{11}{33}+\frac{16}{64}+\frac{3}{15}+\frac{12}{15}+\frac{22}{33}+\frac{48}{64}\)

\(=\left(\frac{11}{33}+\frac{22}{33}\right)+\left(\frac{16}{64}+\frac{48}{64}\right)+\left(\frac{3}{15}+\frac{12}{15}\right)\)

\(\frac{33}{33}+\frac{64}{64}+\frac{15}{15}\)

\(=1+1+1\)

\(=3\)

ket qua la 3 do

@nguyễn thị phương anh đây nhé :

\(\frac{12}{21}+\frac{11}{22}=\frac{264}{462}+\frac{231}{462}=\frac{495}{462}\)

\(\frac{9}{32}+\frac{35}{11}=\frac{99}{352}+\frac{1120}{352}=\frac{1219}{352}\)

\(\frac{12}{21}+\frac{11}{22}=\frac{4}{7}+\frac{1}{2}=\frac{8}{14}+\frac{7}{14}=\frac{15}{14}\)

\(\frac{9}{32}+\frac{35}{11}=\frac{99}{352}+\frac{1120}{352}=\frac{1219}{352}\)

a) <

b) =

c) >

d) <

e) <

\(\frac{2010}{2011}< \frac{2011}{2012}\)

\(\frac{11}{12}=\frac{22}{24}\)

\(\frac{25}{30}>\frac{25}{49}\)

\(\frac{1}{5}< \frac{3}{8}\)

\(\frac{1995}{1997}< \frac{1995}{1996}\)

bạn giải thế này nhé

   12 x 11 + 21 x 11 + 22 x 33 + 11  

= 12 x 11 + 21 x 11 + 22 x 33 + 11 x 1       

= 11 x ( 12 + 21 + 22 + 1 ) 

= 11 x            56

=       616                              

đáp án đó

15/22

               Tk cho Mk nhe

bằng 18/22

\(\frac{9}{22}\)và \(\frac{3}{11}\)

Ta có : \(\frac{3}{11}=\frac{6}{22}\)

\(\frac{9}{22}+\frac{6}{22}=\frac{15}{22}\)

Ủng hộ nhé ! 

quy đồng 3/11=6/22

6/22+9/22=15/22

đ/s:15/22

=22/6 k mik nha

22/3:2

=11/3

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\(100-98+96-94+.\ldots+24-22+20\)

\(=\left(100-98\right)+\left(96-94\right)+\cdots+\left(24-22\right)+20\)

\(=2+2+\ldots+2+20\) (có 20 số hạng 2)

\(=20.2+20=20.3\)

\(=60\)

60 nha bạn