有关数学整式的乘除计算:1.(-ab-2)(-ab+2);2.(a^2-0.1)(a^2+0.1);3.(a+1/3b)^2;4.(2x+5)^2-(2x-5)^2

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有关数学整式的乘除计算:1.(-ab-2)(-ab+2);2.(a^2-0.1)(a^2+0.1);3.(a+1/3b)^2;4.(2x+5)^2-(2x-5)^2
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有关数学整式的乘除计算:1.(-ab-2)(-ab+2);2.(a^2-0.1)(a^2+0.1);3.(a+1/3b)^2;4.(2x+5)^2-(2x-5)^2
有关数学整式的乘除
计算:
1.(-ab-2)(-ab+2);
2.(a^2-0.1)(a^2+0.1);
3.(a+1/3b)^2;
4.(2x+5)^2-(2x-5)^2

有关数学整式的乘除计算:1.(-ab-2)(-ab+2);2.(a^2-0.1)(a^2+0.1);3.(a+1/3b)^2;4.(2x+5)^2-(2x-5)^2
1.(-ab-2)(-ab+2)
=(-ab)^2-2^2
=a^2b^2-4
2.(a^2-0.1)(a^2+0.1);
=a^4-0.01
3.(a+1/3b)^2;
=a^2+2a/3b+1/9b
4.(2x+5)^2-(2x-5)^2
=(2x+5+2x-5)(2x+5-(2x-5))
=4x *10
=40x

1.(-ab-2)(-ab+2) =(-ab)^2-2^2 =a^2b^2-4 2.(a^2-0.1)(a^2+0.1); =a^4-0.01 3.(a+1/3b)^2; =a^2+2a/3b+1/9b 4.(2x+5)^2-(2x-5)^2 =(2x+5+2x-5)(2x+5-(2x-5)) =4x *10 =40x