计算或化简:(本小题共5小题,第(1)3分其余每小题4分,共19分)(1)2-1+4?38+(2)0(2)2x2y?(-3xy)
计算或化简:(本小题共5小题,第(1)3分其余每小题4分,共19分)(1)2-1+4?38+(2)0(2)2x2y?(-3xy)÷(xy)2(3)(-2a)?(3a2-a...
计算或化简:(本小题共5小题,第(1)3分其余每小题4分,共19分)(1)2-1+4?38+(2)0(2)2x2y?(-3xy)÷(xy)2(3)(-2a)?(3a2-a+3)(4)(x+3)(x+4)-(x-1)2(5)[2a3x2?(a-2x)-34a2x2]÷(-ax)2
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(1)2-1+
?
+(
)0,
=
+2?2+1,
=
;
(2)2x2y?(-3xy)÷(xy)2,
=-6x3y2÷x2y2,
=-6x;
(3)(-2a)?(3a2-a+3),
=-6a3+2a2-6a;
(4)(x+3)(x+4)-(x-1)2,
=x2+7x+12-(x2-2x+1),
=9x+11;
(5)[2a3x2?(a-2x)-
a2x2]÷(-ax)2,
=(2a4x2-4a3x3-
a2x2)÷(a2x2),
=2a2-4ax-
.
4 |
3 | 8 |
2 |
=
1 |
2 |
=
3 |
2 |
(2)2x2y?(-3xy)÷(xy)2,
=-6x3y2÷x2y2,
=-6x;
(3)(-2a)?(3a2-a+3),
=-6a3+2a2-6a;
(4)(x+3)(x+4)-(x-1)2,
=x2+7x+12-(x2-2x+1),
=9x+11;
(5)[2a3x2?(a-2x)-
3 |
4 |
=(2a4x2-4a3x3-
3 |
4 |
=2a2-4ax-
3 |
4 |
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