ʱ : һ 广东省广州市海珠?019年中考数学一模试?Word?含答案解? - 百度文库ϿʼĶ
yԳƣPΪmn+ֵ
2414֣֪ABǡOֱCڡOϣPABӳһ㣬CP 1ͼ1PCBA ֱ֤PCǡOߣ CPCAOA2CPij
2ͼ2MǻABе㣬CMABڵNMN?MC9BMֵ
2514֣֪yax2+ax+ba0ֱy2x+mһM10ab
1baĹϵʽߵĶD꣨aĴʽʾ 2ֱߵһΪNDMNaĹϵʽ
3a1ʱֱy2xڵڶڵGGHԭԳƣֽ߶GHyƽtλt0߶GHͬĹ㣬tȡֵΧ
2019㶫ʡкпѧһģԾ
ο
һѡ⣨10С⣬30֣ÿС3֣
1ƽĶóabֵabķŵóabţɵóabֵ
𡿽⣺a24b29 a2b3 ab0
a2b3 a2b3
abֵΪ235235 ѡB
ҪƽĶԼij˷֪ʶóabֵǽؼ 2Aԭʽͬݵij˷õжϣ Bԭʽݵij˷㷨õжϣ Cԭʽϲͬθʽõжϣ Dԭʽܺϲ 𡿽⣺Aԭʽx5 Bԭʽx6 Cԭʽ2
ȷ
Dԭʽܺϲ ѡC
˶θʽļӼϲͬͬݵij˷Լݵij˷ij˷㷨ǽⱾĹؼ
3ʽĽ⼯ȻݡңС˵ʵģ˵ÿġԭʽĽ⼯ϱʾٽбȽϿɵõ𰸣 𡿽⣺
һʽĽ⼯Ϊx3
ڶʽĽ⼯Ϊx2 ԲʽĽ⼯Ϊ3x2 ϱʾʽĽ⼯Ϊ
ѡC
ÿʽĽ⼯ϱʾһϵĵֳɶΣijһʾ⼯ߵ벻ʽĸһôξDzʽĽ⼯мҪڱʾ⼯ʱݡܡҪʵԲʾҪÿԲʾ
4ƽߵ3BAC90㣬𰸣 𡿽⣺ֱab 1355㣬 ACAB BAC90㣬
2180㩁BAC335㣬 ѡA
ƽߵʵӦãע⣺ƽߵТֱƽУͬλȣֱƽУڴȣֱƽУͬڽǻ
5ҵ濴õͼμɣעеĿⶼӦͼУ 𡿽⣺濴õһ2ΣڶһΣ ѡB
ͼ֪ʶͼǴ濴õͼ 6λĶֱнɣ 𡿽⣺ɱ֪5ִ࣬Ϊ5 Ϊ20ݣ
λΪ1011ݵƽλΪ
6