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(x +20):12+68=78
(x+282-75):2=104
X x4:10+101=133
Vă rog frumos cu Metoda mersului invers


Răspuns :

(x+20):12=78-68
(x+20):12=10
x+20=10×12
x+20=120
x=120-20
x=100

(x+282-75):2=104
(x+282-75=104×2
x+282-75=208
x+282=208+75
×+282=283
x=283-282
x=1

x×4:10+101=133
x×4:10=133-101
x×4:10=32
x×4=32×10
x×4=320
x=320:4
x=80