(1)(2)(?8)?(?1)?10?7LLL1? ??8?1LLL1?
(?7)?(?10)?3LLLLL1?(3)?3?4?19
??7?19LL2? ?12LLLL2?(4)(34?712?76)?60 ?34?60?712?60?76?60LL2? ?45?35?70LLLLLLL1??10LLLLLLLLLLL1?(5)?32???2?2??9?4LLL2? ??5LLLLL2? 24、
(1)2(2a2?9b)?3(?5a2?4b)
?4a2?18b?15a2?12bLL2? ?4a2?15a2?18b?12bLL1???11a2?6bLLLLLLL2? 25、
(1)x?12?9x?9?12LL1? x?21LLL1???7LLLL1?(4)(3774?12?6)?60或?(912?712?1412)?60LL2? ?16?60LLLLLLL1??10LLLLLLLL1?(6)?22?7?(?28)?7?5 ??4?7?(?4)?5LLLL2???28?4?5LLLLLL1???19LLLLLLLLL1?(2)2x2?5x?x2?4x?3x2?xLLLLLL1?把x??3代入上式,LLL1?原式=3(?3)2?(?3)LLL1?
?3?9?3LLLLL1??30LLLLLLL1?(2)3?x?16?x?16?3L1? x??13LL1?
(3)16x?23?916x?9?23LL2?16x?32LL1?x?2LL1?
(4)6x?9?5x?86x?5x?8?9LL2?x??1LL2?
13x?1(6)x?(2x?1)?1?34(5)8x?12??4(5x?7)12x?4(2x?1)?12?3(3x?1)LL1?8x?12??20x?28L1?12x?8x?4?12?9x?3LLL1?8x?20x??28?12L1?
13x?11LLLLLLLLLLL1?28x??40LL1?x??
26、(1)解:设最小的数为x,则其余3个数是x+1,x+7,x+8,根据题意得……1分
x?x?1?x?7?x?8?108………………………………2分
x?23…………………………………………1分
答(或则,……):———23号、24号、30号、31号。………1分
(2)解:设这个零件的高是x cm , 根据题意得………………………1分
10LL1?711x?LLLLLLLLLLL1?1310??22?x………………………………2分
x?2.5cm…………………………………1分
答:这个零件的高是2.5cm。……………………………1分