35 x ( 50 + 49 + 1 ) 

= 35 x 100

= 3500

gửi kb cho tớ nhé 

35*50+35*49+35

=35*50+35*49+35*1

=35*(50+49+1)

=35*100

=3500

Tk nha

35 x 50 - 35 x 49 + 3

= 36 x (50 + 49) + 3

= 36 x 99 + 3

= 3564 + 3

= 3567

35 x 50 - 35 x 49 + 3

=35x(50-49)+3

=35x1+3

=35+3  

=38

35 × 50 + 35 × 49 + 35 = 35 x ( 50 + 49 + 1) = 35 x 100 = 3500

   35 \(\times\) 49 + 51 \(\times\) 36

= 35 \(\times\) 49 + 51 \(\)\(\times\) (35 + 1)

= 35 \(\times\) 49 + 35 \(\times\) 51 + 51

= (35 \(\times\) 49 + 35 \(\times\) 51) + 51

= 35 \(\times\)( 49 + 51) + 51

= 35 \(\times\) 100 + 51

= 3500 + 51

= 3551

a, 45451: x = 151

x = 45451 : 151

x = 301

b, x  x 35 = 25 x 49

x x 35 = 1225

x = 1225 : 35

x = 35

\(\frac{x}{27}=\frac{12}{18}\)

Vì \(\frac{x}{27}=\frac{12}{18}\Rightarrow x\cdot18=27\cdot12\)

\(\Rightarrow x=\frac{27\cdot12}{18}=18\)

\(\frac{35}{49}=\frac{10}{x}\)

Vì \(\frac{35}{49}=\frac{10}{x}\Rightarrow35\cdot x=49\cdot10\)

\(\Rightarrow x=\frac{49\cdot10}{35}=14\)

35 x 49 + 51 x 36 = 35 x 49 + 51 x ( 35+1) =35 x 49 + 51 x 35 + 51 = 35 x ( 49 + 51 ) + 51 = 35 x 100 + 51 = 3500+51 = 3551

=(36-1)x49+51x36

=36x49-1x49+51x36

=36x49-49+51x36

=36x(49+51)-49

=36x100-49

=3600-49

=3551

TK

50 : x + 35 : x = 5

(  50 + 35 ) : x = 5

85 : x = 5

x = 85 : 5

x = 17

\(50:x+35:x=5\\ \Rightarrow\left(50+35\right):x=5\\ \Rightarrow85:x=5\\ \Rightarrow x=85:5\\ \Rightarrow x=17\)

7/11 

\(\dfrac{7}{11}\)