1989198819851983 19873)3972(19861992)(1986 A 22 ´´´ ´-+´- = . 21 4 : 3 2 25,15)(28,57:6,84 433,81)(34,06 1,2)(0,82,5 0.1)(0,2:3 :26C + - ´- + +´ - = 0,125.: 4 1 1)1,8333 0,25: 5 1 136:(1,2 12,8 1 9,8999 6,5:6,35)(7 D ´-+ ´+- = . 3 5 D = 131 4 : 0, 003 0,3 1 1 2202 : 62 17,81: 0, 0137 1301. 1131 20 32,654:1,882 20 5 25 8 x éù æö æ ö ´ ç÷ ç ÷ êú èø è ø êú -+= æöæö êú -´ +´ ç÷ç÷ êú èøèø ëû 13 2 5 1 1 :2 1 15, 2 0, 25 48, 51:14,7 44 11 66 2 5 . 1 3, 2 0,8 5 3, 25 2 y æö ´ ç÷ ´- èø = æö +´ - ç÷ èø a m a a m m a m a 1]0,01m)[(1 m 100 n -+ a 1 3 1 7 1 15 1 1 292 + + + + 33102 4687 3 1 u 2 u 1n u + n u 1n u - 1n u + 12 u 37 u 38 u 39 u 2 1 u u 3 2 u u 4 3 u u 5 4 u u 6 5 u u 12 u 37 u 38 u 39 u 2 1 u u 3 2 u u 4 3 u u 5 4 u u 6 5 u u 1 4 1 n n n x x x + + = + 1n x + 1 x 100 x 100 x 1n x + 1 x 100 x 100 x 131 4 : 0, 003 0,3 1 1 2202 : 62 17,81: 0,0137 1301. 1131 20 32,654:1,882 20 5 25 8 x éù æö æ ö ´ ç÷ ç ÷ êú èø è ø êú -+= æöæö êú -´ +´ ç÷ç÷ êú èøèø ëû x a m a m 1]0,01m)[(1 m 100 n -+ a m a m a m 1) Lập một quy α 2 sin 2 S S HAK ABCD = .5cm3079,66332)sin(2absin 2 1 S 22 »-= αα 5 12 p 1 4 1 n n n x x x + + = + 1n x + 1 x 100 x 1n x + 1 x 100 x 100 x 100 x 1 3 1 7 1 15 1 1 292 + + + + 33102 4687