方程的意义教案ppt课件.ppt
,” “,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, . ,” “ , , ., ,X,X,X,4 .( ).x20+ (5),3 .( ).x= 0 (4), . ( ). (1), . ( ) (2), .( ). (3), :,2X = 50,X + 73 = 166,继续, ., , ! -.,