题目内容
先化简,再用你喜爱的数代入求值:(
-
)÷
.
| x+2 |
| x2-2x |
| x-1 |
| x2-4x+4 |
| x-4 |
| x3-2x2 |
原式=(
-
)•
=
•
=
•
=
•
=
,
取x=3,得原式=3.(x取不为0、2、4的数,计算正确都给分.)
| x+2 |
| x(x-2) |
| x-1 |
| (x-2)2 |
| x2(x-2) |
| x-4 |
=
| (x+2)(x-2)-x(x-1) |
| x(x-2)2 |
| x2(x-2) |
| x-4 |
=
| x2-4-x2+x |
| x-2 |
| x |
| x-4 |
=
| x-4 |
| x-2 |
| x |
| x-4 |
=
| x |
| x-2 |
取x=3,得原式=3.(x取不为0、2、4的数,计算正确都给分.)
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