计算这道题??
来源:百度知道 编辑:UC知道 时间:2024/09/22 09:43:43
(0.1+0.2+0.3+0.4+0.5)×(0.6+0.7+0.8+0.9+1)=?
6
(0.1+0.2+0.3+0.4+0.5)×(0.6+0.7+0.8+0.9+1)
=( 0.3 x 5 ) x ( 0.3 x 5 + 0.5 x 5 )
=( 1.5 ) x ( 1.5 + 2.5 )
= 1.5 x 4
= 6
★★★ 试试看:
(0.1+0.2+0.3+0.4+0.5)×(0.6+0.7+0.8+0.9+1)
=(0.1+0.5)×5×(0.6+1.0)×5/(2×2)
=0.6×5×1.6×5/4
=6
(2+1)*(2^2+1)*(2^4+1)*(2^8+1)*(2^16+1)
=(2-1)*(2+1)*(2^2+1)*(2^4+1)*(2^8+1)*(2^16+1)
=(2^2-1)*(2^2+1)*(2^4+1)*(2^8+1)*(2^16+1)
=2^31-1
=2147483647
A^2-B^2=(A+B)(A-B)
(0.1+0.2+0.3+0.4+0.5)×(0.6+0.7+0.8+0.9+1)= 1.5*4=6
(0.1+0.2+0.3+0.4+0.5)×(0.6+0.7+0.8+0.9+1)
=1.5×4
=6