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)÷

题目简介

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)÷

题目详情

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-
1
2
a2)÷(-
1
2
a2)

(6)(2ab2-b32÷2b2
(7)2011×2013-20122(简便计算)
(8)40
2
3
×39
1
3
(简便计算)
题型:解答题难度:中档来源:不详

答案

(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+class="stub"1
2
b4;

(7)原式=(2012+1)-20122
=20122-1-20122
=-1;

(8)原式=(40+class="stub"2
3
)×(40-class="stub"2
3

=402-(class="stub"2
3
)2
=1600-class="stub"4
9

=1599class="stub"5
9

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