计算:(1)(a+b)(a-2);(2)(x-12)(x+12);(3)(m+n)(m-n);(4)(0.1-x)(0.1+x);(5)(x+y)(-y+x).-数学

题目简介

计算:(1)(a+b)(a-2);(2)(x-12)(x+12);(3)(m+n)(m-n);(4)(0.1-x)(0.1+x);(5)(x+y)(-y+x).-数学

题目详情

计算:
(1)(a+b)(a-2);
(2)(x-
1
2
)(x+
1
2
)

(3)(m+n)(m-n);
(4)(0.1-x)(0.1+x);
(5)(x+y)(-y+x).
题型:解答题难度:中档来源:不详

答案

(1)(a+b)(a-2)
=a2+ba-2a-2b,
(2)(x-class="stub"1
2
)(x+class="stub"1
2

=x2-class="stub"1
4

(3)(m+n)(m-n)
=m2-n2,
(4)(0.1-x)(0.1+x)
=0.01-x2,
(5)(x+y)(-y+x)
=x2-y2.

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