(68+10)x 7= 546

 là p/S hay là nhân chia ??????

x + 630 = 630 + 1000

x + 630 = 1630

x          = 1630 - 630

x          = 1000

x + 630 = 630 + 1000

x + 630 = 1630

x          = 1630 - 630

x          = 1000

x + 630 = 630 + 1000

x + 630 = 1630

x = 1630 - 630

x = 1000

Mk nhanh nhất đó

**** mk nha 

x + 630 = 250 + 630

x + 630 = 880

x = 880-630

x = 250

x + 630 = 250 + 630

=> x + 630 =880

=> x = 880 - 630 

=> x = 250

x=250

a ,   x = − 265 x = − 948 b ,   x = − 641 x = − 431

\(\left(567-x\right)+121=641\)

\(\left(567-x\right)=641-121=520\)

\(x=567-520=47\)

\(\left(567-x\right)+121=641\)

\(567-x=641-121\)

\(567-x=520\)

\(x=567-520\)

\(x=47\)

(567-x)+121=641

567-x=641-121

567-x=520

x=567-520

x=47

43,57 x 2,6 x ( 630 - 315 x 2 )

=43,57 x 2,6 x ( 630 - 630 )

=43,57 x 2,6 x 0

= 0

0

0

43,57 x 2,6 x (630-315)x2=71367,66

420 + x = 630

x = 630 - 420

x = 210

Vậy x = 210

K mk nha

Mk k lại

x=630-420

x=210

420+x=630

x=630-420

x=210

y x 18,5 + y x 9,5 = 630

\(\Rightarrow\)y x (18,5 +  9,5 )= 630

\(\Rightarrow\)y = 22,5