293 x 45 + 293 x 50 x 5

= 293 x 45 + 293 x 250

= 293 x ( 45 + 250 ) 

= 293 x 295

= 86435

293 x 45 + 293 x 50 x 5 

= 293 x ( 45 + 50 + 5 ) 

= 293 x    100

= 29300

k minh nha

89658 : x = 293

x = 89658 :293

x = 306

=>x=89658:293=306

= 306

\(\Rightarrow x=8968-293\)
\(\Rightarrow x=8675\)

Mik ko vt lại đề đâu

\(\left(\frac{x+14}{200}+1\right)+\left(\frac{x+27}{187}+1\right)+\left(\frac{x+105}{109}+1\right)=\left(\frac{x+200}{14}+1\right)\)

\(+\left(\frac{x+187}{27}+1\right)+\left(\frac{x+109}{105}+1\right)\)

\(\Rightarrow\frac{x+214}{200}+\frac{x+214}{187}+\frac{x+214}{109}-\frac{x+214}{14}-\frac{x+214}{27}-\frac{x+214}{105}=0\)

\(\Rightarrow\left(x+214\right)\left(\frac{1}{200}+\frac{1}{187}+\frac{1}{109}-\frac{1}{14}-\frac{1}{27}-\frac{1}{105}\right)=0\)

Mà \(\frac{1}{200}+\frac{1}{187}+\frac{1}{109}-\frac{1}{14}-\frac{1}{27}-\frac{1}{105}\ne0\)

\(\Rightarrow x+214=0\)

\(\Rightarrow x=-214\)

Vậy x = -214

x = -214

KQ: 560; 5624

a) x x 405 = 86265

x = 86265 : 405

x = 213

b) 89658 : x = 293

x = 89658 :293

x = 306

(x-293):7+25=89

x=(89-25)x7+293

x=741

(x - 293 ) : 7 + 25 = 89

(x - 293 ) : 7         = 89 -25

(x - 293 ) :7          = 64

(x - 293 )              = 64 . 7

(x - 293 )              = 448

x                         = 448 + 293

x                        = 741