解:①
x+
=
,
x+
-
=
-
,
x=
,
x×
=
×
,
x=
;
②8x+2.4=21.6,
8x+2.4-2.4=21.6-2.4,
8x=19.2,
8x÷8=19.2÷8,
x=2.4;
③6x-2.6-1.4x=6.6,
(6-1.4)x-2.6=6.6,
(6-1.4)x-2.6+2.6=6.6+2.6,
4.6x=9.2,
4.6x÷4.6=9.2÷4.6,
x=2.
分析:①根據(jù)等式的性質(zhì),兩邊同減去
,再同乘
即可;
②根據(jù)等式的性質(zhì),兩邊同減去2.4,再同除以8即可;
③先把原式變?yōu)椋?-1.4)x-2.6=6.6,根據(jù)等式的性質(zhì),兩邊同加上2.6,得4.6x=9.2,兩邊再同除以4.6即可.
點評:此題考查了根據(jù)等式的性質(zhì)解方程,即等式兩邊同加、同減、同乘或同除以一個數(shù)(0除外),等式的左右兩邊仍相等;注意等號上下要對齊.