Question

a] 4+6*[9-2*3]≈ b] 16+2*[22-21:7]≈ c] 18:3+5*[11+5*{23-48:12}]≈ d] 10-9+8*{[7-{6+5-4}]+3-{2+1}]≈

Answer 1

a) 4+6×(9-2×3)=

=4+6×(9-6)

=4+6×3

=4+18

=22

b) 16+2×(22-21:7)=

=16+2×(22-3)

=16+2×19

=16+38

=54

c)18:3+5×[11+5×(23-48:12)]=

=6+5×[11+5×(23-2)]

=6+5×(11+5×21)

=6+5×(11+105)

=6+5×116

=6+580

=586

d)10-9+8×{[7-(6+5-4)]+3-(2+1)}=

=10-9+8×{[7-(11-4)]+3-3}

=10-9+8×[(7-7)+3-3]

=10-9+8×(0+3-3)

=10-9+8×0

=10-9+0

=1+0

=1