1?ËÌXÍüýùúã÷øùúPÏûä.\r2L“ = 5 0 Rüýùú?÷øùúp\r`¶G\r þ@ 1 ax2.8-a = 2.8a-a = 1.8à¶\r2LP=50 R\r\.Sa = 1.8x50 = 90 ¶\r @üýùú?÷øùúp90¶..\r25. 2019Ázÿ 0@P`p?\n?\r??\n??4 16?.\r1`\n?\r2`\n?? !?\r3`#” = 8 0 )?\n?? !?\r*+,-+. 1` 4/+ 1 6 ?`\r,.\n4/+ 16?.\r2` 4a+ 16 +\r= 5\r+ 16 ?`\r,.\n?? !" + 16?.\r3`4 /= 80 565/+ 16\r= 5x80 + 16\r= 400 + 16\r= 416 ? `\r,.#a = 80)?\n?? !416?.\r26. 201889:;@<`= “?@AB\nC”DEFGHC?= IJKL=MNOPQ130R,\rTUVPQx W.\r1`= XY1000W?Z[\W ]^_`aGbcde?`\r2`T x = 7 , gh iZ[\W\r*+,-+. j 1 0 0 0 T 3 0 X W`\r2`4 m=7 561000-130XP,\ro 1000-130x\r= 1000-130x7\r= 1000 - 910\r=9/ W`\r,.= XY1000W?Z[\a00°-130x`WrT x = 7 , Z[\90W