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Mathematics in the sixth grade of primary school, the second volume of mathematics exercise book, 53 pages of answers.
1, 4 * 28-25-(25+1)-(25+2) = 34 (years old)

2.( 1) one quarter (2) one half (3) one sixth

3. After drawing, pay attention to whether the title, data and date are marked on the statistical chart.

(1) (150+200+250+230+200)/5 = 206 (m/min)

I estimate that Yun Yun runs170m in the sixth minute. Because the more time you run, the lower your physical strength and the slower your running speed.