1ï¼éæ©é¢ï¼
ï¼1ï¼æ-2-ï¼+3ï¼-ï¼-5ï¼+ï¼-4ï¼+ï¼+3ï¼åæçç¥æ¬å·åçå½¢å¼ï¼æ£ç¡®çæ¯ï¼ ï¼
Aï¼-2-3-5-4+3 Bï¼-2+3+5-4+3
Cï¼-2-3+5-4+3 Dï¼-2-3-5+4+3
ï¼2ï¼è®¡ç®ï¼-5ï¼-ï¼+3ï¼+ï¼-9ï¼-ï¼-7ï¼+ æå¾ç»ææ£ç¡®çæ¯ï¼ ï¼
Aï¼-10 Bï¼-9 Cï¼8 Dï¼-23
ï¼3ï¼-7ï¼-12ï¼+2ç代æ°åæ¯å®ä»¬çç»å¯¹å¼çåå°ï¼ ï¼
Aï¼-38 Bï¼-4 Cï¼4 Dï¼38
ï¼4ï¼è¥ +ï¼b+3ï¼2=0,åb-a- çå¼æ¯ï¼ ï¼
Aï¼-4 Bï¼-2 Cï¼-1 Dï¼1
ï¼5ï¼ä¸å说æ³æ£ç¡®çæ¯ï¼ ï¼
Aï¼ä¸¤ä¸ªè´æ°ç¸åï¼çäºç»å¯¹å¼ç¸å
Bï¼ä¸¤ä¸ªè´æ°çå·®ä¸å®å¤§äºé¶
Cï¼æ£æ°åå»è´æ°ï¼å®é
æ¯ä¸¤ä¸ªæ£æ°ç代æ°å
Dï¼è´æ°åå»æ£æ°ï¼çäºè´æ°å ä¸æ£æ°çç»å¯¹å¼
ï¼6ï¼ç®å¼-3-5ä¸è½è¯»ä½ï¼ ï¼
Aï¼-3ä¸5çå·® Bï¼-3ä¸-5çå
Cï¼-3ä¸-5çå·® Dï¼-3åå»5
2ï¼å¡«ç©ºé¢ï¼ï¼4â²Ã4=16â²ï¼
ï¼1ï¼-4+7-9=- - + ï¼
ï¼2ï¼6-11+4+2=- + - + ï¼
ï¼3ï¼ï¼-5ï¼+ï¼+8ï¼-ï¼+2ï¼-ï¼-3ï¼= + - + ï¼
ï¼4ï¼5-ï¼-3 ï¼-ï¼+7ï¼-2 =5+ - - + - .
3ï¼æä¸ååå¼åæçç¥æ¬å·çåçå½¢å¼ï¼å¹¶è¯´åºå®ä»¬ç两ç§è¯»æ³ï¼ï¼8â²Ã2=16â²ï¼
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ï¼2ï¼-2 -ï¼- ï¼+ï¼-0.5ï¼+(+2)-(+ )-2.
4.计ç®é¢(6â²Ã4=24â²)
(1)-1+2-3+4-5+6-7;
(2)-50-28+(-24)-(-22);
(3)-19.8-(-20.3)-(+20.2)-10.8;
(4)0.25- +(-1 )-(+3 ).
5.å½x=-3.7,y=-1.8,z=-1.5æ¶,æ±ä¸å代æ°å¼çå¼(5â²Ã4=20â²)
(1)x+y-z; (2)-x-y+z; (3)-x+y+z; (4)x-y-z.
ãç´ è´¨ä¼åè®ç»ã
(1) (-7)-(+5)+(+3)-(-9)=-7 5 3 9;
(2)-(+2 )-(-1 )-(+3 )+(- )
=( 2 )+( 1 )+( 3 )+( );
(3)-14 5 (-3)=-12;
(4)-12 (-7) (-5) (-6)=-16;
(5)b-a-(+c)+(-d)= a b c d;
2.å½x= ,y=- ,z=- æ¶,åå«æ±åºä¸å代æ°å¼çå¼;
(1)x-(-y)+(-z); (2)x+(-y)-(+z);
(3)-(-x)-y+z; (4)-x-(-y)+z.
3.å°±ä¸åç»çä¸ç»æ°,éªè¯çå¼ï¼
a-(b-c+d)=a-b+c-dæ¯å¦æç«.
(1)a=-2,b=-1,c=3,d=5;
(2)a=23 ,b=-8,c=-1 ,d=1 .
4.计ç®é¢
(1)-1-23.33-(+76.76);
(2)1-2*2*2*2;
(3)(-6-24.3)-(-12+9.1)+(0-2.1);
(4)-1+8-7
ãçæ´»å®é
è¿ç¨ã
ææ°´å©åå¯é,第ä¸å¤©åä¸æ¸¸èµ°5 åç±³,第äºå¤©ååä¸æ¸¸èµ°5 ,第ä¸å¤©åä¸æ¸¸èµ°4 åç±³,第å天ååä¸æ¸¸èµ°4.5åç±³,è¿æ¶åå¯éå¨åºåç¹çåªé?ç¸è·å¤å°åç±³?
åèçæ¡ï¼
ãåæ¥è¾¾çº²ç»ä¹ ã
1.(1)C;(2)B;(3)D;(4)A;(5)C;(6)C 2.(1)4,(-7),(-9) (2)(-6),(-11),(-4),2; (3)-5,8,2,3; (4)3,7,2;
3.ç¥4.(1)-4; (2)-80; (3)-30.5 (4)-5
5.(1)-4; (2)4; (3)0.4; (4)-0.4.
ãç´ è´¨ä¼åè®ç»ã
1.(1)-,+,+; (2)-,+,-,-; (3)+,+; (4)-,+,+; (5)-,+,-,-.
2.(1) (2) (3) (4)-
3.(1) (2)é½æç«.
4.(1)-
(2)
(3)-29.5
(4)-1 第(4)é¢æ³¨æåå·çæ°ãäºä¸ºç¸åæ°å
åå«ç»åã
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