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Afla numarul necunoscut:
a)575-b x 32-45=50
b)c-(600-315:9)=335
c) (100 x d - 110):39=10
d) 20 x e-(1950+550):100=6175
e) 35 x f+(800-752:4):2=551
f) g:25+(100-1632:51)x2=286
g) 244-h x 5+(300-6x16):4=255


Răspuns :

a)575-b x 32-45=50
575-b x32=95
575-95=b x 32
480=bx32
b=480/ 32=15

b)c-(600-315:9)=335
c- (600-35)=335
c-565=335
c=335+565=900

c)(100 x d - 110):39=10
100 x d-110=10x39
100xd-110=390
100 xd=390+110
100 x d=5oo
d=500/100=5

d)20 x e-(1950+550):100=6175
20 x e-2500/100=6175
20 x e-25=6175
20x e=6175+25
20 xe =6200
e=6200/20=310

e)35 x f+(800-752:4):2=551
35 x f+(800-188)/2=551
35 x f+ 612 / 2=551
35 x f+306=551
35 x f=551-306
35 x f =245
f=245/35=7

f)g:25+(100-1632:51)x2=286
g/25 +(100-32)x 2=286
g/25 +68 x 2=286
g/25+136=286
g/25=286-136
g/25=150
g=150 x 25=3750

g)244-h x 5+(300-6x16):4=255
244-hx 5+(300-96)/ 4=255
244- h x 5+204 / 4=255
244-h x5+ 51=255
244-h x 5=255-51
244-h x 5=204
244-204=h x5
40=hx5
h=40/5=8