Question

Calcule as expressões numéricas:

A)3/4 -(-2/5 +0,9)-1/2=

Answer 1

3/4-(-2/5+9/10)-1/2=

3/4-(-4/10+9/10)-1/2=

3/4-(+5/10)-1/2=

3/4-5/10-1/2=

15/20-10/20-10/20=

15/20-20/20=

-5/20 ou -0,25