数学【人教版】五年级上《稍复杂的方程例2》哈ppt课件.ppt

, : 2- , ,4X43=9.6 125+4X=78.4,：4X12=9.6,4X12+12=9.6 +12,4X=21.6,4X4=21.64,X=5.4, ：60+4X=78.4,4X=78.460,4X=18.4,X=18.44,X=4.6, . - . - . - , 2 3 2.8 2.8 ( ), + = , + = ,2.42+2.83=13.2（）: : 13.2 , 2 3 13.2 2.8 , + = , + = ,: X ,2X+2.83=13.2,2X+8.4=13.22X+8.48.4=13.2 8.4 2X=4.8 2X2=4.82 X=2.4 : 2.4 , 2 10.4 2.8 , + = , + = ,: X ,2X+2.82=10.4,2X+5.6=10.42X+5.65.6=10.4 5.6 2X=4.8 2X2=4.82 X=2.4 : 2.4 , ( ),: X 2 ( + ) = （X+2.8) 2=10.4, ,(x+2.8) 22=10.42,( ),X+2.8=5.2,X+2.82.8=5.22.8 X=2.4,( ), : 2.4 ,( ),2x+2.82=10.4(X+2.8) 2=10.4, , : c=b (x+a) x+a x+a x ., ,8(x6.2)=41.6 (x3) 2=7.5,5(X+1.5)=17.5,（X-2.6) 2=8,2 . . X 6 6 3.1 64.2,3 . ,1. ,（26+x) 2=150, ., , . : 10 10 5 . 55 . , : X (X-10 ) .,10X5（10 X）=55,10X 5 10+5X=55,10X 50+5X=55,10X +5X 50=55,15X 50=55,15X=55+50,15X=105,X=10515,X=7, : 7 ., , ,c=b (x+a) x+a ., !,