鍒濅腑鏁板璇曞嵎
鐏胯嫢瀵掓槦鏁寸悊鍒朵綔
鏈熸湯澶嶄範
(
涓?/p>
)
涓�鍏冧竴娆℃柟绋?/p>
鑰冪偣涓�
鏂圭▼鍙婃柟绋嬬殑瑙?/p>
銆?/p>
渚?/p>
1
銆?/p>
鑻?/p>
x
锛?/p>
2
鏄叧浜?/p>
x
鐨勬柟绋?/p>
2x+3m-1
锛?/p>
0
鐨勮В锛屽垯
m
鐨勫�肩瓑浜?/p>
____.
銆?/p>
鍒嗘瀽
銆?/p>
灏?/p>
x
锛?/p>
2
浠ｅ叆鏂圭▼
2x+3m-1
锛?/p>
0
锛屽緱鍒板叧浜?/p>
m
鐨勪竴鍏冧竴娆℃柟绋?/p>
2
脳
2+3m-1
锛?/p>
0
锛岃В杩欎釜鍏充簬
m
鐨勬柟绋嬪嵆鍙?/p>
.
銆?/p>
瑙ｇ瓟
銆?/p>
-1
銆?/p>
鏂规硶褰掔撼
銆?/p>
姹傛柟绋嬩腑鏌愪簺瀛楁瘝鐨勫�兼椂锛屽彧瑕佸皢鏂圭▼鐨勮В浠ｅ叆鏂圭▼锛屽嵆鍙緱鍒板叧浜庡緟姹傚瓧姣嶇殑鏂圭▼锛岃В杩欎釜鏂圭▼
鍗冲彲
.
1.(2012
路閲嶅簡
)
宸茬煡鍏充簬
x
鐨勬柟绋?/p>
2x+a-9=0
鐨勮В鏄?/p>
x=2
锛屽垯
a
鐨勫�间负
(
)
A.2
B.3
C.4
D.5
2.
璇峰啓鍑轰竴涓В涓?/p>
x=-2
鐨勪竴鍏冧竴娆℃柟绋嬶細
_______________.
鑰冪偣浜?/p>
绛夊紡鐨勬�ц川
銆?/p>
渚?/p>
2
銆?/p>
杩愮敤绛夊紡鎬ц川杩涜鐨勫彉褰紝姝ｇ‘鐨勬槸
(
)
A.
濡傛灉
a=b
锛岄偅涔?/p>
a+c=b-c
B.
濡傛灉
c
a
=
c
b
锛岄偅涔?/p>
a=b
C.
濡傛灉
a=b
锛岄偅涔?/p>
c
a
=
c
b
D.
濡傛灉
a
2
=3a
锛岄偅涔?/p>
a=3
銆?/p>
鍒嗘瀽
銆?/p>
c
a
=
c
b
闅愬惈鐫�
c
鈮?/p>
0
锛屾墍浠ユ牴鎹瓑寮忕殑鎬ц川
2
锛岀瓑寮忎袱杈瑰悓涔樹竴涓暟锛岀粨鏋滀粛鐩哥瓑
.
銆?/p>
瑙ｇ瓟
銆?/p>
B
銆?/p>
鏂规硶褰掔撼
銆?/p>
瑙ｅ喅姝ょ被闂瑕佺揣鎵ｇ瓑寮忕殑鎬ц川锛岃鐗瑰埆娉ㄦ剰绛夊紡鐨勬�ц川
2(
闄ゆ暟鎴栭櫎寮忎笉鑳戒负
0).
3.
涓嬪垪璇存硶涓紝鈶犺嫢
mx=my
锛屽垯
mx-my=0
锛涒憽鑻?/p>
mx=my
锛屽垯
x=y
锛涒憿鑻?/p>
mx=my
锛屽垯
mx+my=2my
锛涒懀鑻?
x=y
锛屽垯
mx=my.
姝ｇ‘鐨勪釜鏁版槸
(
)
A.1
涓?/p>
B.2
涓?/p>
C.3
涓?/p>
D.4
涓?/p>
鑰冪偣涓?/p>
涓�鍏冧竴娆℃柟绋嬬殑瑙ｆ硶
銆?/p>
渚?/p>
3
銆?/p>
瑙ｆ柟绋嬶細
2x+13-10x+16=1.
銆?/p>
鍒嗘瀽
銆?/p>
鏍规嵁瑙ｄ竴鍏冧竴娆℃柟绋嬫柟绋嬬殑姝ラ瑙ｆ柟绋嬪嵆鍙?/p>
.
銆?/p>
瑙ｇ瓟
銆?/p>
鍘诲垎姣嶏紝寰?/p>
2(2x+1)-(10x+1)=6.
鍘绘嫭鍙凤紝寰?/p>
4x+2-10x-1=6,
绉婚」锛屽緱
4x-10x=6-2+1,
鍚堝苟锛屽緱
-6x=5,
绯绘暟鍖栦负
1
锛屽緱
x=-
6
5
.
銆?/p>
鏂规硶褰掔撼
銆戣В涓�鍏冧竴娆℃柟绋嬫椂锛岃鐏垫椿瀹夋帓鍚勪釜姝ラ鐨勬搴?/p>
(
涓嶄竴瀹氭瘡涓楠ら兘瑕佺敤鍒?/p>
)
锛屽敖閲忛�夋嫨璁＄畻绠�渚跨殑鏂?/p>
娉曪紝鍦ㄦ暣涓眰瑙ｈ繃绋嬩腑锛岃娉ㄦ剰閬垮厤鍘诲垎姣嶏紝鍘绘嫭鍙凤紝绉婚」鏃跺父鍑虹幇鐨勯敊璇?/p>
.
4.
瑙ｆ柟绋嬶細
(1)15-(7-5x)=2x+(5-3x)
锛?/p>
(2)
4
1
-
x
-1=
6
1
x
2
飥?/p>
.