解方程 x÷
22x-
|
(1)x÷
=14 15 1 7
x÷
×14 15
=14 15
×1 7 14 15
x=
;2 15
(2)
x=483 4
x÷3 4
=48÷3 4 3 4
x=64;
(3)22x-
=3 40 19 40
22x-
+3 40
=3 40
+19 40 3 40
22x=11 20
22x÷22=
÷2211 20
x=
;1 40
(4)
-2x=3 4 1 4
-2x+2x=3 4
+2x1 4
=3 4
+2x1 4
-3 4
=1 4
+2x-1 4 1 4
=2x1 2
÷2=2x÷21 2
x=
.1 4