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\u6570\u5b66\u9898\u3002(x-2)(x+1)>=0--> x>=2 or x<=-1
(x-3)(x+2) -2=< x<=3
\u6240\u4ee5 2=<x<=3 or -2=<x <=-1
1.\u57283\uff0c9\uff0c16\uff0c8\uff0c28\u6570\u4e2d\uff0c\uff0816 \uff09\u662f4\u548c8\u6700\u5c0f\u516c\u500d\u6570\uff0c\uff088 \uff09\u662f16\u548c24\u7684\u6700\u5927\u516c\u56e0\u6570\u3002
2.\u4e00\u68395\u7c73\u957f\u7684\u7ef3\u5b50\u5e73\u5747\u5206\u62108\u6bb5\uff0c\u6bcf\u6bb5\u662f\u8fd9\u6839\u7ef3\u5b50\u7684\uff088/5 \uff09\uff0c\u6bcf\u6bb5\uff088/5 \uff09\u7c73\u3002
3.\u4e00\u4e2a\u6570\u75316\u4e2a\uff0c4\u4e2a\u767e\u4e07\uff0c5\u4e2a\u5343\u548c9\u4e2a\u4e00\u7ec4\u6210\uff0c\u8fd9\u4e2a\u6570\u5199\u4f5c\uff08604005009\uff09\uff0c\u8bfb\u4f5c\uff08\u516d \u4ebf\u96f6\u56db\u767e\u4e07\u4e94\u5343\u96f69 \uff09\uff0c\u7701\u7565\u4e07\u540e\u9762\u7684\u5c3e\u6570\u7ea6\u662f\uff086401\u4e07 \uff09
4. \u89e3\u65b9\u7a0b\u3002 1.8x - x =2.4 0.8x=2.4 x=3 \uff08x + 0.4\uff09\u00d7 6=5.4 6x+2.4=5.4 6x=5.4-2.4 x=0.5
\u4e09\u5206\u4e4b\u4e00\uff1a3/1\u4e8c\u5341\u5206\u4e4b\u4e0920/3 =\u4e5d\u5206\u4e4b\u4e03\uff1a9/7
s=xy/2 y=k/x ---xy=k s=xy/2=k/2 k=1,2,3,4,---20
应该是成等差数列唷
105
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