(1)计算:|?3|+(π?3)0?8÷2+4×2?1(2)先化简:a2?b2a2?ab÷(a+2ab+b2a),当b=-1时,再从-2<a<3的
(1)计算:|?3|+(π?3)0?8÷2+4×2?1(2)先化简:a2?b2a2?ab÷(a+2ab+b2a),当b=-1时,再从-2<a<3的范围内选取一个合适的整数...
(1)计算:|?3|+(π?3)0?8÷2+4×2?1(2)先化简:a2?b2a2?ab÷(a+2ab+b2a),当b=-1时,再从-2<a<3的范围内选取一个合适的整数a代入求值.
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(1)|?3|+(π?3)0?
÷
+4×2?1,
=3+1-2
+4×
,
=4-2
+2,
=6-2
;
(2)
÷(a+
),
=
÷(
),
=
×
,
=
,
当b=-1时,假设a=2,代入上式得:
原式=
,
=
8 |
2 |
=3+1-2
2 |
1 |
2 |
=4-2
2 |
=6-2
2 |
(2)
a2?b2 |
a2?ab |
2ab+b2 |
a |
=
(a?b)(a+b) |
a(a?b) |
a2+2ab+b2 |
a |
=
a+b |
a |
a |
(a+b) 2 |
=
1 |
a+b |
当b=-1时,假设a=2,代入上式得:
原式=
1 |
a+b |
=