题目内容
计算下列各题:
(1)(
xy)2-(-12x2y2)÷(-
x3y)
(2) (x+2)2-(x+1)(x-1)
(3)(-
)-2×10-1-(-
)0
(4)(
a4b7+
a3b8-
a2b6)÷(-
ab3)2
(1)(
| 1 |
| 3 |
| 4 |
| 3 |
(2) (x+2)2-(x+1)(x-1)
(3)(-
| 1 |
| 2 |
| 1 |
| 2 |
(4)(
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 2 |
(1)(
xy)2•(-12x2y2)÷(-
x3y)
=
x2y2•12x2y2÷
x3y
=xy3;
(2) (x+2)2-(x+1)(x-1)
=x2+4x+4-x2+1
=4x+5;
(3)(-
)-2×10-1-(-
)0
=4×
-1
=-
;
(4)(
a4b7+
a3b8-
a2b6)÷(-
ab3)2
=(
a4b7+
a3b8-
a2b6)÷
a2b6
=3a2b+2ab2-1.
| 1 |
| 3 |
| 4 |
| 3 |
=
| 1 |
| 9 |
| 4 |
| 3 |
=xy3;
(2) (x+2)2-(x+1)(x-1)
=x2+4x+4-x2+1
=4x+5;
(3)(-
| 1 |
| 2 |
| 1 |
| 2 |
=4×
| 1 |
| 10 |
=-
| 3 |
| 5 |
(4)(
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 2 |
=(
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
=3a2b+2ab2-1.
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