闀囨睙甯傛鼎宸炲尯
2018
灞婁節骞寸骇绗簩娆℃ā鎷熻�冭瘯鏁板璇曢
涓�銆佸～绌洪
锛?/p>
锛堟瘡灏忛
2
鍒嗭紝鍚堣
24
鍒嗭級
1
锛庘�?/p>
2
鐨勭粷瀵瑰�间负
.
2.
鍒嗚В鍥犲紡锛?/p>
3x
2
-12= .
3.
鍑芥暟
1
2
y
x
飥?
飥?/p>
涓紝鑷彉閲?/p>
x
鐨勫彇鍊艰寖鍥存槸
.
4.
濡傚浘锛?/p>
AB
鈭?/p>
CD
锛?/p>
CB
骞冲垎鈭?/p>
ACD
锛屸垹
ABC=35
掳锛屽垯鈭?/p>
BAE=
搴?/p>
.
5
锛庡凡鐭ヤ竴缁勪粠灏忓埌澶т緷娆℃帓鍒楃殑鏁版嵁锛?/p>
2
銆?/p>
5
銆?/p>
x
銆?/p>
y
銆?/p>
2x
銆?/p>
11
鐨勫钩鍧囨暟鍜?/p>
涓綅鏁伴兘鏄?/p>
7
锛屽垯杩欑粍鏁版嵁
鐨勪紬鏁版槸
.
绗?/p>
4
棰樺浘
绗?/p>
6
棰樺浘
绗?/p>
7
棰樺浘
6
锛庡鍥撅紝鍦ㄢ柍
ABC
涓紝鈭?/p>
ACB=90
掳锛屸垹
A=30
掳锛屽皢鈻?/p>
ABC
缁曠偣
C
椤烘椂閽堟棆杞埌鈻?/p>
A
鈥?/p>
B
鈥?/p>
C
锛屼娇鐐?/p>
B
鈥?/p>
钀藉湪杈?/p>
AB
涓婏紝鍒欐棆杞涓?/p>
搴?/p>
.
7.
濡傚浘锛岀偣
A
銆?/p>
B
銆?/p>
C
銆?/p>
D
銆?/p>
E
鍦ㄢ姍
O
涓婏紝涓?/p>
禄
AE
鐨勫害鏁颁负
50
掳锛屽垯鈭?/p>
B+
鈭?/p>
D
鐨勫害鏁颁负
.
8.
濡傚浘锛屽湪骞抽潰鐩磋鍧愭爣绯讳腑锛屸姍
M
缁忚繃鐐?/p>
A
锛?/p>
0
锛?/p>
4
锛?/p>
锛岀偣
B
锛?/p>
3
锛?/p>
0
锛?/p>
锛岀偣
P
涓衡姍
M
涓婁竴鐐癸紝涓斿湪绗竴
璞￠檺锛屽垯
sin
鈭?/p>
P
鐨勫�间负
.
9
锛庡叧浜?/p>
x
銆?/p>
y
鐨勪簩鍏冧竴娆℃柟绋嬬粍
3x
y
1
m
x
y=3
飥?/p>
飥?/p>
飪?/p>
飪?
飥?/p>
飪?
=
鐨勮В婊¤冻
2x+y
锛?/p>
1
锛屽垯
m
鐨勫彇鍊艰寖鍥存槸
锛?/p>
10
锛庡鍥撅紝鍦ㄥ钩闈㈢洿瑙掑潗鏍囩郴涓紝宸茬煡鐐?/p>
A(1
锛?/p>
1)
锛岀偣
B(4
锛?/p>
1)
锛岀偣
C(2
锛?/p>
3)
锛岃嫢鍙嶆瘮渚嬪嚱鏁?/p>
x
k
y
飥?
鐨勫浘璞′笌鈻?/p>
ABC
鏈夊叕鍏辩偣锛屽垯
k
鐨勫彇鍊艰寖鍥存槸
锛?/p>
Y
X
M
P
B
O
A
绗?/p>
8
棰樺浘
绗?/p>
10
棰樺浘
绗?/p>
11
棰樺浘
11
锛庡鍥撅紝鎶涚墿绾?/p>
y=ax
2
+bx+1(a
鈮?/p>
0)
缁忚繃鐐?/p>
A
锛?/p>
-3
锛?/p>
0
锛?/p>
锛屽绉拌酱涓虹洿绾?/p>
x= -1
锛屽垯
(a+b)(4a-2b+1)
鐨勫�间负
锛?/p>