em bit lam rui

17/6 à

\(\frac{173}{2}.43+\frac{4}{34}\)

\(=\frac{7439}{2}+\frac{4}{34}\)

\(=\frac{126467}{34}\)

học vui học ngu

\(\frac{173}{2}\cdot43+\frac{4}{34}=\frac{7439}{2}+\frac{3}{34}=\frac{252926}{34}+\frac{3}{34}=\frac{252929}{34}\)

2 -  ( 2/8 + x - 173/24 ) : 50/3 = 0 

      ( 2/8 + x - 173/24 ) : 50/3  = 2 -  0 

      ( 2/8 + x - 173/24 ) : 50/3  = 2 

        2/8 + x - 173/24               = 2 x 50/3 

        2/8 + x - 173/24               = 100/3

        2/8 + x                              = 100/3 + 173/24

        2/8 + x                              = 973/24

                 x                              = 973/24 - 2/8 

                 x                              = 967/24                           

\(2-\left(\frac{2}{8}+x-\frac{173}{24}\right)\text{ : }\frac{50}{3}=0\)

\(2-\left(\frac{2}{8}+x-\frac{173}{24}\right)=0\text{ x }\frac{50}{3}\)

\(2-\left(\frac{2}{8}+x-\frac{173}{24}\right)=0\)

\(\frac{2}{8}+x-\frac{173}{24}=2-0\)

\(\frac{2}{8}+x-\frac{173}{24}=2\)

\(\frac{2}{8}+x=2+\frac{173}{24}=\frac{48}{24}+\frac{173}{24}\)

\(\frac{2}{8}+x=\frac{221}{24}\)

\(x=\frac{221}{24}-\frac{2}{8}=\frac{221}{24}-\frac{6}{24}\)

\(x=\frac{215}{24}\)

\(\frac{5+8+11+14+...+68+71}{2\times43+3\times43+43\times5+7}\).

Xét tử số: 5+ 8+ 11+ 14+...+ 68.

Có số các số hạng là:

( 68- 5): 3+ 1= 22

Tử số là:

 ( 68+ 5)x 22: 2= 803

Xét mẫu số: 2x 43+ 3x 43+ 43x 5+ 7=( 2+ 3+ 5)x 43+ 7= 10x 43+ 7= 430+ 7= 437.

=> \(\frac{5+8+11+14+...+68+71}{2\times43+3\times43+43\times5+7}\)= \(\frac{803}{437}\).

a. 64 x 25 + 35 x 25 + 25

= 64 x 25 + 35 x 25 + 25 x 1

= 25 x ( 64 + 35 + 1 )

= 25 x 100 

= 2500

b. 58 x 42 + 32 x 8 + 5 x 16

c. ( 42 x 43 + 57 x 43 + 43 ) - 360 : 4

= 42 x 43 + 57 x 43 + 43 x 1 - 90

= 43 x ( 42 + 57 +1 ) - 90

= 43 x 100 - 90

= 4300 - 90

= 4210

d. 456 : 2 x 181456 : 3 - 102

Trả lời:

a,\(64\times25+35\times25+25\)

\(=25\times\left(64+35+1\right)\)

\(=25\times100\)

\(=2500\)

b,\(58\times42+32\times8+5\times16\)

\(=2436+256+80\)

\(=2772\)

c,\(\left(42\times43+57\times43+43\right)-360\div4\)

\(=43\times\left(42+57+1\right)-90\)

\(=43\times100-90\)

\(=4300-90\)

\(=4210\)

d,\(456\div2\times181456\div3-102\)

\(=228\div3\times181456-102\)

\(=76\times181456-102\)

\(=13790656-102\)

\(=13790554\)