计算:(1)(-3xy2)3?(16x3y)2;(2)4a2x2?(-25a4x3y3)÷(-12a5xy2);(3)(2x-y)(4x2-y2)
计算:(1)(-3xy2)3?(16x3y)2;(2)4a2x2?(-25a4x3y3)÷(-12a5xy2);(3)(2x-y)(4x2-y2)(2x+y);(4)x2...
计算:(1)(-3xy2)3?(16x3y)2;(2)4a2x2?(-25a4x3y3)÷(-12a5xy2);(3)(2x-y)(4x2-y2)(2x+y);(4)x2?(x+2)(x?2)?(x+1x)2.
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张凯747
2015-02-09
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(1)(-3xy
2)
3?(
x
3y)
2,
=-27x
3y
6?
x
6y
2,
=-
x
9y
8;
(2)4a
2x
2?(-
a
4x
3y
3)÷(-
a
5xy
2),
=4a
2x
2?(-
)a
4x
3y
3÷(-
)a
5xy
2,
=
ax
4y;
(3)(2x-y)(4x
2-y
2)(2x+y),
=(4x
2-y
2)(4x
2-y
2),
=(4x
2-y)
2,
=16x
4-8x
2y
2+y
4;
(4)
x2?(x+2)(x?2)?(x+)2,
=x
2-x
2+4-x
2-2-
,
=-x
2+2-
.
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