雅虎香港 搜尋

  1. 7k-( 9k -16)=14-(19-k) 7k- 9k +16=14-19+k (拆括號,負負得正。) 7k- 9k -k=14-19-16 -3k=-21 k=-7

  2. 1) 7k-( 9k -16)=14-(19-k) 7k (19-k)=14 ( 9k -16) 7k-k 19=14 9k -16 6k 19=(-2) 9k 6k 19- 9k =(-2) -3k 19=(-2) -3k=(-2...

  3. 1) 7k-( 9k -16) = 14-(19-k) 7k- 9k +16 = 14-19+k -2k+16 = -5+k 21...

  4. 1.7k-( 9k -16)=14-(19-k) 7k- 9k +16=14-19+k -2k-k =14-19-16 -3k =-21 k = 7 2.2【p-2(p+1)】-1=8p+25 2【p-2p-2】-1 =8p+25 2p-4p-4-1 =8p+25 -2p-5 =8p+25 -10p =25+5 p =-3

  5. 7K-( 9K -16)=14-(19-K) 求K 16-2K=K-5 3K...

  6. 1. 7k-( 9k -16) = 14-(19-k) 7k- 9k +16 = 14-19+k -2k+16 = -5+k 21 = 3k k = 7 2. 7(y-3) = 3[1...

  7. let a = 6k, b = 8k, c = 9k then 1/a = 1/6k, 1/b = 1/8k, 1.c = 1/ 9k 1) 1/6k : 1/8k = 1/6 : 1/8 = 24/6 : 24/8 = 3 : 4 2) 1/8k : 1/ 9k = 1/8 : 1/9 = 72/8 : 72/9 = 9 : 8 3) 1/6k : 1/8k : 1/ 9k = 1/6k : 1/8k : 1/ 9k = 72/6 : 72/8 : 72/9 = 12 : 9 : 8

  8. ...4y+3z =x+5x+4y-4y+3z-z =(1+5)x+(4-4)y+(3-1)z =6x+2z 3. ( 2h - k ) - ( 5h - 9k ) =2h-k-5h+ 9k =2h-5h-k+ 9k =(2-5)h+(-1+9)k =-3h+8k 負數,你懂的吧? 4. 6...

  9. ...要正變負,負變正} -13y= +26{相除} y= -2 4) 7k-( 9k -16)= 14-(19-k) 7k- 9k +16= 14-19+k {拆括號} -2k+16= -5+k (同類項...

  10. 1 7+2e=9e-14-6e 7+14=9e-6e-2e e=21 2、5y-4(3y-2)=-20 5y-12y+8=-20 28=7y y=4 3、7k-( 9k -16)=14-(19-k) 7k- 9k +16=14-19+k 21=3k k=7