1-Calcule as expressões

a)✓
b)25+[12-(32+1)]×
c)90-[25+(5÷2-1)+3]×
d)45+[(8÷5-10÷2)+(18÷6-2)]×
e)50-2×{7+8÷2-[9-3÷(5-4)]}×
f)100-3÷{5+8÷2-[3÷(7-6)]}×

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