= 1-2x 1.4 14+3x 1.732

= 1-2.828+5. 196

= 1.368

≈ 1.4

②2√3-3√2-√5- Keep three significant figures.

= 2x 1.732-3x 1.4 14+2.236

=3.464-4.242+2.236

= 1.458

≈ 1.46

③√ 125-2/√5 (accurate to ten places)

=5√5-2√5

=3√5

=3x2.236

=6.708

≈6.7