(1)(-3
(2)[(0.1)-2+(0.01)-1]×(-
(3)(3x-2)-1÷(
(4)(a-2-b-2)÷(a-1-b-1) (5)x-2y-2÷(x-2-y-2) (6)(2x-2+y)2-(2x-2-y)2. |
(1)(-3
)-3-(23 4
)-1+(-1 2
)21 2
=-
+64 3375
+2 5 1 4
=
;8519 13500
(2)[(0.1)-2+(0.01)-1]×(-
)-31 10
=[100+100]×(-1000)
=200×(-1000)
=-200000;
(3)(3x-2)-1÷(
x)-2•(1 2
)23y-1 2x
=
•x2 3
•x2 4 9 4x2y2
=
;3x2 16y2
(4)(a-2-b-2)÷(a-1-b-1)
=(
-1 a2
)÷(1 b2
-1 a
)1 b
=
•(b+a)(b-a) a2b2 ab b-a
=
;a+b ab
(5)x-2y-2÷(x-2-y-2)
=
÷(1 x2y2
-1 x2
)1 y2
=
÷1 x2y2 y2-x2 x2y2
=
;1 (y+x)(y-x)
(6)(2x-2+y)2-(2x-2-y)2.
=4x-4+2x-2y+y2-(4x-4-2x-2y+y2)
=4x-4+2x-2y+y2-4x-4+2x-2y-y2
=4x-2y.