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The second volume of the seventh grade, mathematics synchronous guidance answer, 85, 86, 87 pages, Su teaches fast.
P85 Exercise in class 1) 7x+3y- 1. 2)-5。 P86 Page 3) 5. Multiple choice questions: BBDA. 8) brace x=2, y= 1, z= half. Braces x=6, y= 1, z=7. Braces x=5, y=-2 and z= one third. Braces a=3, b=-2, c=-5. 10)x=2 1，y= 12，z=8 . 1 1)x=6，y=7，z=3。 12)x=7，y= 13，z=6 .
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