Answer to No.31of Mathematics Weekly People's Education Edition
I . 1 . b . 2 . c . 3 . c . 4 . b . 5 . b . 6 . b . 7 . b . 8 . c . 2 . 1. 124 . 2 . 3。 (-2,6).(- 1,0). 1. Omit. 2. The nearest coordinates from A to B are (1, 2), (1, 3), (1, 4), (1. 4. 1.s length edbf = 7 * 5 = 35, s △ ADB = 5 * 5 *1/2 =12.5, s △ BFC = 7 * 3 *1/2 =/kloc. S △ ACB = S-LengthACB = S-LengthEDBF-S △ ADB-S △ AEC = 35-12.5-10.5-2 =10, so its area is/kloc-0.