1、 2017 3 30 . 1 3 5 A 5 B 5 C ! D 5 14 . 5 5 D 0 0 2 3 A B C D U1 . A B C D A 3 3 A 2xy 2 = 4x 2 y 2B x 6 x 3 =x 2C x y 2 =x 2 y 2D 2x+3x=5x2 48 35 47 4C . A 2xy 2 =4x 2 y 2 B x 6 x 3 =x 3 C x y 2 =x 2 2xy+y 2 D 2x+3x=5x D 4 3 30 /m 34 5 6 8 9 10 6 7 9 5 2 1 30 A 6 6 B 9 6 C 9 6 D 6 7 W5 W4 . 6 9 9 9
2、 15 16 9 9 6 B 5 3 2 y=ax+b A a+b 0 B a b 0 C ab 0 D ! 0 F7 . y=ax+b a 0 b 0 y=ax+b a 0 b 0 a+b 0 A a b 0 B ab 0 C ! 0 D D a b 6 3 1 A B C D JA . 3 DE BC 2= 3 ABC 1= 3 B 7 3 ABC AB=AC E F BC AC AC Rt ADC CAD= A B DE FDC C D D AB= ! CD KX KH . AB=AC B= Rt ADC AD=DC ECD= ACB+ A FE= ! AB FE AB EFC= FEC
3、= FD= ! AC DF AC FE=FD FDE= B FEC= DEC= FEC C Rt ADC AC= ! CD AB=AC AB= ! CD D AB=AC B= Rt ADC AD=DC ECD= ACB+ A E F BC AC FE= ! AB FE AB EFC= FEC= F AC AD=DC FD= ! AC DF AC AB=AC FE=FD FDE= FED= ! EFD = ! FDE= ! FDC DE FDC B FEC= DEC= FEC C Rt ADC AD=DC AC= ! CD AB=AC AB= ! CD D C 8 3 ABOC C y= ! 2
4、 A A y= ! B y= ! C y= ! D y= ! G6 L8 Q3 . C CD x D a C A 2 C CD x D a Rt CDO ! a ! a C ! a ! a A 2 ! a a ! a 2 ! a ! a 2 ! ! y= ! A 9 3 ABC AC=BC D BC BD=3 DC=1 P AB PC+PD A 4 B 5 C 6 D 7 PA KW . C CO AB O CO AB P CP DP+CP=DP+ DC=1 BC=4 BD=3 21cnj*y.co*m C CO AB O CO AB P CP DP+CP=DP+ DC=1 BC=4 BD=3
5、 BC ! = ! =5 B P PC+PD 10 3 l y= x+4 x y A B l m O x 1 x y C D t 0 t 4 CD CDE E O CD CDE OAB S S t A B C D E7 . 0 t 2 2 t 4 S t 0 t 2 S= ! t 2 2 t 4 S= ! t 2 ! 2t 4 2 = ! t 2 +8t 8 S t C C 3 24 11 3 + 2018 29150000000 29150000000 2.915 10 10 1I . a 10 n 1 |a| 10 n n a n 10 n 1 n 21 * 29150000000=2.9
6、15 10 10 2.915 10 10 a 10 n 1 |a| 10 n a n 21*cnjy*com 12 3 y= ! x x 1 E4 . 0 x 1 0 0 x+1 0 x x 1 0 x+1 0 x 1 x 1 1 2 0 3 13 3 20 10% 15% 15 X8 . 10% 15% 75% 10% 15% 75% 20 75%=15 15 15 14 3 x k 1 x 2 +2x 2=0 k k ! k 1 AA A1 . k 1 0 =2 2 4 k 1 2 0 k 1 0 =2 2 4 k 1 2 0 k ! k 1 k ! k 1 ax 2 +bx+c=0 a 0 =b 2 4ac 0 =0 0 15 3 ABCD C AB=2 AD=4 ! 2 ! MO R2 . CE=2CD DE=2 ! CDE ABCD AD=BC=4 CD=AB=2 BCD= CE=BC=4 CE=2CD DE=2 ! S=S S CDE= ! ! 2 2 ! = ! !
