问题
解答题
计算 (1)
(2)(3×10-4)3÷(9×10-7) |
答案
(1)原式=a2-25 a-5
=(a+5)(a-5) a-5
=a+5;
(2)原式=27×10-12÷(9×10-7)
=3×10-5.
计算 (1)
(2)(3×10-4)3÷(9×10-7) |
(1)原式=a2-25 a-5
=(a+5)(a-5) a-5
=a+5;
(2)原式=27×10-12÷(9×10-7)
=3×10-5.