计算:(1)25?38?(π?1)0(2)(-x+3y)(-x-3y)(3)(-2a2b)2?(6ab)÷(-3b2) ...
计算:(1)25?38?(π?1)0(2)(-x+3y)(-x-3y)(3)(-2a2b)2?(6ab)÷(-3b2)(4)(2x-1)(3x+2)-6x(x-2)(5)...
计算:(1)25?38?(π?1)0(2)(-x+3y)(-x-3y)(3)(-2a2b)2?(6ab)÷(-3b2) (4)(2x-1)(3x+2)-6x(x-2)(5)(?a4+2a3?12a2)÷(?12a2)(6)(2ab2-b3)2÷2b2(7)2011×2013-20122(简便计算)(8)4023×3913(简便计算).
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(1)原式=5-2-1
=2;
(2)原式=(-x)2-(3y)2
=x2-9y2;
(3)原式=4a4b2?(6ab)÷(-3b2)
=-8a5b;
(4)原式=6x2+x-2-6x2+12x
=13x-2;
(5)原式=2a2-4a+1;
(6)原式=(4a2b4-4ab5+b6)÷2b2
=2a2b2-2ab3+
b4;
(7)原式=(2012-1)(2012+1)-20122
=20122-1-20122
=-1;
(8)原式=(40+
)×(40-
)
=402-(
)2
=1600-
=1599
.
=2;
(2)原式=(-x)2-(3y)2
=x2-9y2;
(3)原式=4a4b2?(6ab)÷(-3b2)
=-8a5b;
(4)原式=6x2+x-2-6x2+12x
=13x-2;
(5)原式=2a2-4a+1;
(6)原式=(4a2b4-4ab5+b6)÷2b2
=2a2b2-2ab3+
1 |
2 |
(7)原式=(2012-1)(2012+1)-20122
=20122-1-20122
=-1;
(8)原式=(40+
2 |
3 |
2 |
3 |
=402-(
2 |
3 |
=1600-
4 |
9 |
=1599
5 |
9 |
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