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10×3×9-30:3:10+11=7×f

Răspuns :

10×3×9-30:3:10+11=7×f
270-1+11=7f
280=7f
7f=280
f=280:7
f=40
10x3x9-30:3:10+11=7xf
30x9-10:10+11=7xf
270-1+11=7xf
269+11=7xf
280=7xf
f=280:7
f=40
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