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The answer to the first volume of seventh grade mathematics basic training
Shanghai science edition seventh grade mathematics basic training examination paper

The second chapter tests the answers of volume B.

I. Multiple-choice questions: BDCDB II. Fill in the blanks (1 1) 3, -7 (2 points will be deducted for missing one item) (13)10xx (15) 0 or 4 III. Problem solving 17, (1 17, 1) 40 ((3).

1 3

A: The fuel consumption of * * * on this day is 68 liters, 20. Solution: 34-a-(A 3)-(2A3) (1) = 28-4A When a=6, 28-4a=28-4×6 =28-24=4 A Answer: Fourth. When a=6 ㎝, the length of the fourth side is 4 ㎝. (2) No, because when a = 7,28-4a = 28-4× 7 = 0, the length of the fourth side is 0 ㎝, and this figure is a triangle.

(It should be this volume. I've been looking for it for a long time. You can ask if you don't understand. )