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10 x 3 x 9 - 30 : 3 : 10 + 11 = 7 x f

Răspuns :

Deeachu
10×3×9-30:3:10+11=7×f
270-10:10+11=7×f
270-1+11=7×f
269+11=7×f

280=7×f => 7×f=280
f=280:7
f=40
MerryChristmas1
10×3×9-30:3:10+11=7×f
__________________
30×9-10:10+11=7×f
270-1+11=7×f
269+11=7×f
280=7×f
f=280:7
f=40


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