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確認問題1(文字式の計算2)解答

確認問題1(文字式の計算2)解答


(1)  2/3a-1/2a=4/6a-3/6a


              =1/6a


  答え  1/6a



(2)  2a-5/6a-3/8a=48/24a-20/24a-9/24a


                  =48/24a-20-9/24a


                  =48/24a-29/24a


                  =19/24a


  答え  19/24a


(3)  4a+1-(5-a)=4a+1-5+a


               =4a+a+1-5


               =5a-4



  答え  5a-4


(4)  2(4a-3)+3(2-3a)=8a-6+6-9a


                    =8a-9a-6+6
     
                    =-a



  答え  -a


(5)  7(4a-1)-3(9a-5)=28a-7-27a+15


                    =28a-27a+15-7


                    =a+8



  答え  a+8



(6)  3(a+5)-(a-2)=3a+15-a+2


                 =3a-a+2+15


                 =2a+17



  答え  2a+17



(7)  χ-{3χ-2-(4χ-5)=χ-(3χ-2-4χ+5)


                    =χ-3χ+2+4χ-5


                    =χ-3χ+4χ+2-5


                    =2χ-3



  答え  2χ-3



(8)  4(3/4χ-1/2)-6(χ-2/3)=3χ-2-6χ+4


                         =3χ-6χ-2+4


                         =-3χ+2


 


  答え  -3χ+2


(9)  1/4(χ+2)+1/8(5χ-4)=1/4χ+1/2+5/8χ-1/2


                       =1/4χ+5/8χ+1/2-1/2


                       =2/8χ+5/8χ+1/2-1/2


                       =7/8χ



  答え  7/8χ



(10)  1/2(6-4a)-5(3/5a-1)=3-2a-3a+5


                         =3+5-2a-3a


                         =8-5a


                         =-5a+8



  答え  -5a+8



(11)  (4χ-5)/6-(χ-2)/2=(4χ-5)/6-3(χ-2)/6


                      =(4χ-5)/6-(3χ-6)/6


                      =(4χ-5)-(3χ-6)/6


                      =4χ-5-3χ+6/6


                      =4χ-3χ+6-5/6


                      =χ+1/6



  答え  χ+1/6


 

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