Question

1)-invente um a situação problema e resolva :

A)2x+x=21
B)7+5+12+x=40
C)x/3=12
D)x+7=31
E)x+12-10=15
F)x-12,50=17,50
G)x+38=115
H)x-147=58
I)7x=-91
J)x/2=19
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Answer 1

Resposta:

a) 2x+x=21 > 3x=21 > x=21/3 > x=7

b) 7+5+12+x=40 > 24+x=40 > x=40-24 > x=16

c) x/3=12 > x=12.3 > x= 36

d) x+7=31 > x=31-7 > x=24

e) x+12-10=15 > x+2=15 > x=15-2 > x=13

f) x-12,50= 17,50 > x=12,50+17,50 > x= 30

g)x+38=115 > x=115-38 > x=77

h)x-147=58 > x=58+147 > x=205

i)7x=-91 > x=91/7 > x= -13

j)x/2=19 > x=19.2 > x=38