(2) 1000 20
2.( 10-7)÷7× 100%≈42.9%
3.( 16- 14)÷ 16× 100%= 12.5%
Solve it yourself
5.(4350-2700)÷4350× 100%≈37.9%
6.( 1.25- 1.2)÷ 1.2× 100%≈4.2%
7.(30- 18)÷ 18× 100%≈66.7%
(30- 18)÷ 12× 100%= 150%
8. Analysis: The volume of the sawed cube is V = A33× 3x3 = 27 (cm3).
The original volume is v = abh5× 4× 3 = 60 (cm3).
(60-27)÷60× 100%=55%