1 第7课时第1题答案
略
2 第7课时第2题答案
(1)4a
(2)65-m
(3)x÷4
(4)1/2m-5n
(5)2y+10
3 第7课时第3题答案
(1)x=100
(2)x=25
4 第7课时第4题答案
x=12;m=32;x=21;x=0.88
5 第7课时第5题答案
男教师:20人;女教师:97人
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