解:(1)(
-
)x=
,
x
=
,
x=2.4;
(2)7x÷
=
,
7x÷
×
=
×
,
7x÷7=
7,
x=
;
(3)
x-
x=
,
x=
,
x
=
,
x=1.75;
(4)x-15%x=37.4,
85%x÷85%=37.4÷85%,
x=44;
(5)X+
=
,
X+
=
,
x=
;
(6)x÷(1-
)=
,
x
=
,
x=
.
分析:(1)先化簡(jiǎn)方程,再依據(jù)等式的性質(zhì),方程兩邊同時(shí)除以
求解;
(2)依據(jù)等式的性質(zhì),方程兩邊同時(shí)乘
,再同時(shí)除以7求解;
(3)先化簡(jiǎn)方程,再依據(jù)等式的性質(zhì),方程兩邊同時(shí)除以
求解;
(4)先化簡(jiǎn)方程,再依據(jù)等式的性質(zhì),方程兩邊同時(shí)除以85%求解;
(5)依據(jù)等式的性質(zhì),方程兩邊同時(shí)減
求解;
(6)先化簡(jiǎn)方程,再依據(jù)等式的性質(zhì),方程兩邊同時(shí)乘
求解.
點(diǎn)評(píng):(1)方程能化簡(jiǎn)先化簡(jiǎn),(2)對(duì)齊等號(hào)是解方程應(yīng)注意問(wèn)題.