a, y x 59 = 8968

y = 8968 : 59

y = 152

b, y : 23 = 158

y = 158 x 23

y = 3634

86+56+5641+546585+56485+58648+6548+674874+456476+74674+9874+748749674+7869774+8968 = 758518363

758 518 363.

= 758518363

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

=293x(45+50)x5

=293x95x5

=139175

89658 : x = 293

x = 89658 :293

x = 306

=>x=89658:293=306

= 306

306

KQ: 560; 5624

a) x x 405 = 86265

x = 86265 : 405

x = 213

b) 89658 : x = 293

x = 89658 :293

x = 306

x - 293 = 187

x         = 187 + 293

x         = 480

x - 293 = 187

x          = 187 + 293

x           = 480

x - 293 = 187

        x = 187 + 293

        x = 480

mik nhah nhất đó

(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

(x-293)/7+25=89

(x-293)/7=89-25

(x-293)/7=64

x-293=64x7

x-293=448

x=448+293

x=741