Toán Lớp 6: (x-15)-75=0 575-(6x+70)=445 2(x-51)=2.2.2.2+20 15:(x+2)=3

Question

Toán Lớp 6:  (x-15)-75=0 575-(6x+70)=445 2(x-51)=2.2.2.2+20 15:(x+2)=3

danvanthu · Answer

(x-15)-75=0       => x-15=75       x=75+15       x=90              575-(6x+70)=445       6x+70=575-445       6x+70=130       6x=130-70       6x=60       =>x=10              2(x-51)=2.2.2.2+20       x-51=(2^4+20):2       x-51=2^4:2+20:2       x-51=2^3+10       x=8+10+51       x=18+51       x=69              15:(x+2)=3       x+2=15:3       x+2=5       x=5-2       x=3

buianhtuan · Answer

( x - 15 ) - 75 = 0       x - 15           = 0 + 75       x                  = 75 + 15       x                   = 90     575 - ( 6x + 70 ) = 445                 6x + 70  = 575 - 445                 6x          = 130 - 70                   x          = 60 : 6                   x          =10     2 ( x - 51 ) = 2 . 2 . 2 . 2 + 20          x - 51 = 36 : 2          x        = 18 + 51          x        = 69     15 : ( x + 2 ) = 3              x + 2   = 15 :3              x         =5 - 2              x         = 3