Mathematics Competition of Grade Seven in Four Schools (Zhejiang Education Edition)

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Four schools * * * same body seventh grade mathematics competition examination questions.

First, multiple-choice questions (5 points for each small question, ***40 points)

1. A grain store sells three brands of flour, and the words (25 0.1) kg, (25±0.2)kg and (25±0.3)kg are marked on the packaging bags respectively. Take out two bags at random, and the difference in quality is at most ().

A.0.8 B. 0.6kg C. 0.5kg D.0.4kg.

2. The following can be calculated by the square difference formula is ().

A.B.

C.D.

3. The stationer sold two calculators at the price of 60 yuan, one earned 20%, the other lost 20%, and then the boss ().

A. earned 5 yuan B. lost 25 yuan C. earned 25 yuan D. lost 5 yuan.

4. The graph is a 4×4 square grid, and the sum of the angles marked in the graph is equal to ().

A.585 B. 540 C. 270 D. 3 15