Reference answer
First, carefully choose one:
1、C 2、C 3、B 4、C 5、B 6、A 7、C 8、A 9、B 10
Second, patiently fill in:
1 1, 12, 13,14,3, 15, 16, b, 17, white,
18、
2 1 (the answer is not unique, as long as it is satisfied)
three
Third, do it with your heart:
19, (1) solution: original formula (2) solution: original formula
20.( 1) solution: the original equation can be transformed into
(2) Solution: The original equation can be simplified as
Fourth, reading questions: 2 1( 1) to the denominator (both sides are multiplied by 30); (2) remove the brackets; (3) Moving projects and merging similar projects; (4) The coefficient is 1.
Five, play math, play middle school math:
22.
23.( 1)2,7, 15, 155 (2)
Six, mathematics and our life:
(1) 16%×3000=480 (person)
(2) footbridges are the most common. 1- 16%-28.7%=55.3%
(3) It is suggested that pedestrians should consciously cross the bridge for the safety of themselves and others.
2007-2008 school year first semester seventh grade mathematics (2)
Reference answer:
fill (up) a vacancy
1, -2,-1, 0, 1, 22,8 or-8 (a solution of1) 3, < 4,5.
5、 7.0× 10 6、 -3 7、-