数学【人教版】五年级上方程的意义 教案 (1) 哈ppt课件.ppt
, 2- , -,继续, - ,20,30,50, - ,20 +30 =50,20,?,100,20+X=100 - ,50,50,50 x2=100,50,x x,50+2180,80,X X ,802x,X X X ,X,50,50,50,3x=180,100+20100+30,100+2x=50 x3,20+30=50 802 20+=100 3=180502=100 100+20100+5050+2 180 100+2=350, :, : ,20+=100 20+30=50 50+2 180 502=100 802 100+20100+50 3=180100+2=350, , ,20+30=50 50+2 180 20+=100 802 502=100 100+20100+50 3=180100+2=350, , , ., 35- =12 ( ) 0.49 =7 ( ) Y+24 ( ) 35+65=100 ( ) 5 +32=47 ( ) -14 72 ( ) 28 16+14 ( ) 9b-3=60 ( ) 6(a+2)=42 ( ) +y=70 ( ),9,10,: , .,(1) 6X + =78 (2) 36 + =42, ,” .“ , , . ., ,1. . ( )2. . ( )3. . ( ) 4. 30 . ( )5. 420 . ( ),X,X,X, .,2X = 50,X + 73 = 166,继续, ,!,