1) 15+[(3x6-2)-(10-6:2)+1]=
= 15+[(18-2)-(10-3)+1]=
=15+[16-7+1]=
=15+[9+1]=
=15+10=
=25
2) 50-{40-3x[5-(10-7)]}=
= 50-{40-3x[5-3]}=
= 50-{40-3x2}=
= 50-{40-6}=
= 50-34=
=16
3) Calcule as expressões
a) 3x75+3x25 = (R:300)
b) 5x97+5x3 = (R:500 )
c) 4x101+4x99 = (R:800)
d) 20x47+80x47 = (R:4700)
e) 12+16:8x3-5 =(R:13)
f) 100-6x7+8:2 =)(R:62)
g) 64:8+5x5-3 = (R: 30)
h) 1+3+5x7-9:3 = (R:36)
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