a) 14 - [(20 – 15) + 3] b) 3+ {17 – [15 – (9 – 4)] }


b) 7+ 6 – 8 – 2 + 1 = d)15 – 10 – 3 – 1 =

c) 15- (10 – 3) – 1 = b)15 – [(10 – 3) – 1] =

d) 20 – 8 – 3 + 4 – 1 d) 20 – 8 – (3 + 4) – 1 e) 20 – {8 – [(3+4) – 1] } f) 20 – [ ( 8 – 3 ) + 4 ] – 1