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2

1.8329 : 38 = 219,1842...

2. a) 7875 : x = 45

       x = 7875 : 45

      x = 175

    b) Y : 12 = 352

        y = 352 . 12

        y = 4224

1.

8329 : 38 = 219 (dư 7)

2. 

A) 7875 : X = 45

                X = 7875 : 45

                X = 175

B) Y : 12 = 352

     Y        = 352 x 12

     Y        = 4224

c thì phải

C.MN=10cm

100% đúng

1.

  \(\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)

\(=\left(\frac{5}{3}+\frac{1}{3}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)

\(=2-1=1\)

\(\frac{2}{7}\cdot\frac{1}{5}+\frac{2}{7}\cdot\frac{4}{5}=\frac{2}{7}\cdot\left(\frac{1}{5}+\frac{4}{5}\right)=\frac{2}{7}\cdot1=\frac{2}{7}\)

                               #Louis

\(1.a)\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)

\(=\left(\frac{5}{3}+\frac{1}{3}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)

\(=2-1\)

\(=1\)

\(b)\frac{2}{7}\times\frac{1}{5}+\frac{2}{7}\times\frac{4}{5}\)

\(=\frac{2}{7}\times\left(\frac{1}{5}+\frac{4}{5}\right)\)

\(=\frac{2}{7}\times1\)

\(=\frac{2}{7}\)

\(2.a)\frac{5}{6}+\frac{7}{12}-\frac{2}{9}\)

\(=\frac{30}{36}+\frac{21}{36}-\frac{8}{36}\)

\(=\frac{43}{36}\)

\(b)\frac{4}{9}\times\frac{5}{8}+\frac{1}{6}\)

\(=\frac{5}{18}+\frac{1}{6}=\frac{5}{18}+\frac{3}{18}\)

\(=\frac{8}{18}=\frac{4}{9}\)

\(c)2:\frac{3}{11}-\frac{13}{12}\)

\(=2\times\frac{11}{3}-\frac{13}{12}\)

\(=\frac{22}{3}-\frac{13}{12}\)

\(=\frac{25}{4}\)

A. 3/4

B. 5/6

C. 13/12

D. 7/8

E. 3/4

G. 5/6

HT

A) 1/2 + 1/4  = 4/8 + 2/8= 6/8   

B) 2/3 + 1/6  = 12/18 + 3/18 = 15/18   

C) 7/12 + 1/2  =  14/24 + 12/24 = 26/24   

D) 1/8 + 3/4  = 4/32 + 24/32 = 28/32 

E) 2/3 + 1/12  = 24/36 + 3/36 = 27/36   

G) 5/8 + 5/24 = 120/192 + 40/192 = 160 / 192

K a nha

A) 1/3 + 1/6 + 1/18 = 6/18 + 3/18 = 9/18+ 1/8= 10/8         

B) 1/20 + 1/4 + 2/5  = 4/80 + 20/80 = 24/80 + 2/5 =  120/400+160/400 = 280/400     

C) 1/12 + 1/6 + 3/4 = 6/72 + 12/72 = 18/72       

 D) 1/4 + 2/25 + 3/100 = 33/100 + 3/100= 36/100

K nha

A. 5/9

B. 7/10

C. 1

D. 9/25

HT
 

A) 3/4 + 1/5  = 15/20 + 4/20= 19/20   

B) 1/36 + 5/12 = 12/432 + 180/432=192/864   

 C) 3/4 + 1/6 = 18/24 + 4/24 = 22/24   

D) 1/8 + 7/10 = 10/80 + 56/80=66/160   

E) 1/8 + 5/6= 6/48 + 40/48= 46/48     

G) 2/3 + 2/7 = 14/21+6/24= 20/24

K nha

câu cuối là bằng 20/42 nha

A) 3/7 + 4/9 + 4/7 + 5/9 = ( 4/9+5/9) + ( 3/7 + 4/7) = 1+ 1 = 2         

B) 1/5 + 4/11 + 4/5 + 7/11 = ( 4/11 + 7/11) + ( 1/5 + 4/5) = 1+1=2         

C) 1/15 + 4/15 + 5/18 + 7/18= ( 1/15+4/15) + (5/18+7/15)= 5/15 + 12/15 = 17/15         

D) 1/8 + 1/12 + 3/8 + 5/12 = (1/8 + 3/8) + ( 1/12 + 1/12) = 4/8 + 2/12 = 64/96

K nha