r1 " W W ?=12X \r29-K 7 }12YZ[\.\r> : 22%290+30%33%28%23°424° +7\r*189?”\r=27°\r3 0 -1 .7 /8T S W ^5_`a 27°\r 1 2 1 3 .\r. : 3.14x40+22x50=62800 d e =62.8 f " , 62.8x0.85=53.38 ?gh.\r3 1 -1 .7 /89ijkli5338gm\r* :5 2 2 x ,\r84+90\r*522" n ,\r=252 ( 9 ) \r522 x ,\r84+90 '\r3 q K\r=2709 ;\r32-1. 7 /?stu2529 ,vstu27w\r. : 36x5x2+(5+3)\r=360+8\r=45(x\r33-1 7 /yzp{?|{}5_~}U45g&.\r /\r8
<Y`2x@%&K\r60*0.8+L2x(x-60)=0.88x\r48+lJx-72=0.88x\r12x-0.88x=72-48\r0.32x=24\rx=24+0.32\rx=75\r0.88x75=66 )\r34-1. 7 /\r8
<Y`266\r. /x `Kku%:\r|x - 5 = 4 (x -5 )\r1T -5=4X . ^ ,\r35x 7 ,\rx=75 .\r35T?7 /7 ` .\r 1 3 1 3
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