Question

qual o valor de x nas figuras?

Answer 1

a)
x+x+10+x+20+x+30=90
4x=90-60
4x=30
x=7,5
b)
4x + 8 + 12x+12 =90
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5 1 1
mmc= 5
4x+40+10x+60 =90
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5
14x+100=450
14x=350
x=25