解方程:
(1)(1-30%)x=5.6???????
(2)2x+40%x=9.6.
网友回答
解:(1)(1-30%)x=5.6,
???????????? ?0.7x=5.6,
???????? 0.7x÷0.7=5.6÷0.7,
???????????????? x=8;
(2)2x+40%x=9.6,
? (2+40%)x=9.6,
??????? 2.4x=9.6,
?? 2.4x÷2.4=9.6÷2.4,
?????????? x=4.
解析分析:(1)先化简方程得,0.7x=5.6,再根据等式的性质,两边同除以0.7即可;
(2)原式变为(2+40%)x=9.6,即2.4x=9.6,再根据等式的性质,两边同除以2.4即可.
点评:本题考查了解方程,利用等式的性质解决即可.注意等号要对齐.