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2+bx9-25=40

(c-104+2)x5+3=98

(dx4 +20):4=12

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Răspuns :

Coco0987
2+b*9-25=40
2+b*9=40+25
2+b*9=65
b*9=65-2
b*9=63
b=63:9
b=7

(c-104+2)*5+3=98
(c-104+2)*5=98-3
(c-104+2)*5=95
c-104+2=95:5
c-104+2=19
c-104=19-2
c-104=17
c=17+104
c=121

(d*4 +20):4=12
d*4+20=12*4
d*4+20=48
d*4=48-20
d*4=28
d=28:4
d=7