一元一次方程及其解法练习2.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,1,.,下面是解方程的全过程，解法正确吗？试给出评判,.,解方程：,3,(,y,-,3,),-,5,(,1,y,)=,7,(,y,-,1,).,解 去括号，得,3,y,-,3,-,5,+,5,y,=,7,y,-,1,.,移项，得,3,y,+,5,y,-,7,y,=,-,1,+,3,-,5,y,=,-,3,（,）,3,y,-,9,-,5,-,5,y,=,7,y,-,7,3,y,-,5,y,-,7,y,=,9,+,5,-,7,y,=,（,）,（,）,2,.,解下列方程：,解 去括号，得,6,=,5,y,-,2,y,-,8.,移项，得,6,+,8,=,5,y,-,2,y,解 去括号，得,5,m,+,40,-,12,m,+,42,=,1.,移项，得,5,m,-,12,m,=,1,-,40,-,42,m,=,13,解 去括号，得,5,x,+,10,=,4,x,+,14.,移项，得,5,x,-,4,x,=,14,-,10,x,=,4,解 去括号，得,6,y,+,3,=,2,+,2,y,+,3,y,+,9.,移项，得,6,y,-,2,y,-,3,y,=,2,+,9,-,3,y,=,8,