早教吧作业答案频道 -->其他-->
(1)(lg5)2+2lg2-(lg2)2(2)(259)0.5+(2764)−23+(0.1)−2−3π0.
题目详情
(1)(lg5)2+2lg2-(lg2)2
(2)(
)0.5+(
)−
+(0.1)−2−3π0.
(2)(
25 |
9 |
27 |
64 |
2 |
3 |
▼优质解答
答案和解析
(1)原式=(lg5+lg2)(lg5-lg2)+2lg2
=lg10×(lg5-lg2)+2lg2
=1×(lg5-lg2)+2lg2
=lg5+lg2
=lg10
=1;
(2)原式=(
)2×0.5+(
)3×(−
)+10-1×(-2)-3π0
=
+
+100-3
=100+
=
.
=lg10×(lg5-lg2)+2lg2
=1×(lg5-lg2)+2lg2
=lg5+lg2
=lg10
=1;
(2)原式=(
5 |
3 |
3 |
4 |
2 |
3 |
=
5 |
3 |
16 |
9 |
=100+
4 |
9 |
=
904 |
9 |
看了 (1)(lg5)2+2lg2...的网友还看了以下:
根据3^2-1^2=8*1、5^3-3^2=8*2、7^2-5^2=8*3这个规律可得的结论是什么 2020-05-13 …
(4/3-5/3)÷10/7(3/2+9/2)÷21/201-14/5÷7/5(4/3-5/3)÷ 2020-05-17 …
求1+2+2^2+2^3+2^4+…+2^2014的值.设S=1+2+2^2+2^3+2^4+…+ 2020-07-09 …
1/2+(1/3+2/3)+(1/4+2/4+3/4)+……+(1/60+2/60+……59/60 2020-07-17 …
观察下列各式3^2-1^2=(3+1)(3-1)=8×1观察下列各式3^2-1^2=(3+1)(3 2020-07-17 …
几个数学问题,请高手回答一下.1.1^2+2^2+3^2+4^2+……(N-1)^2=[(N-1) 2020-07-31 …
帮我检查这道因式分解题(步骤+结果)是这题(5x^2+2x-3)^2-9x^2-2x-3)^2=( 2020-08-03 …
xyz=1,x+y+z=2,x^2+y^2+z^2=3,求x,y,z我解:xy=1/z,x+y=2- 2020-10-31 …
观察下列各式然后回答问题:1-1/2^2=1/2*2/3,1-1/3^2+2/3*4/3,1-1/4 2020-11-01 …
初中数学,因式分解!1.-28m^2-3m^3+m^42.a^n+1-5a^n+6a^n-13.(2 2021-01-22 …