7道初三的直角三角函数计算题
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发布时间:2022-05-27 14:59
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热心网友
时间:2023-10-29 13:23
1:原式=2-√3+1-1/2+√3=5/2
2:原式=3√2-1√-2+4=3+2√2
3:原式=3-√3+1+√3-1=3
4:原式=0.25*4-2-1+√3=-2+√3
5:原式=2√3-2√3-8=-8
6:原式=1/2+3-1-1/2=2
7:原式=1-1-8=-8
热心网友
时间:2023-10-29 13:24
1.|(√3)-2|+(1/5)^0-2^-1+2sin60°
=2-(√3)+1-1/2+2*(√3)/2
=2-(√3)
+1-1/2+(√3)=2又1/2.2.(√18)-(∏-1)^0-2cos45°+(1/4)^-1
=(3√2)-1-2*(√2)/2+4
=(3√2)+3-(√2)
=3+2√2.3.(√9)-tan60°+(√5-1)^0+|1-√3|
=3-(√3)+1+(√3)-1
=34.0.25*(-cos60°)^-2-(√3-1)^0+tan60°
=1/4*1/(1/4)-1+(√3)
=√35.(√12)-4cos30°+(-2)^3
=(2√3)-4*(√3)/2-8
=(2√3)-(2√3)-8
=-8.6.-(-1/2)+(√9)+(-1)^2007-cos60°
=1/2+3-1-1/2
=2.
7.(-1)^0-|tan45°-2|+2^-5*2^8
=1-|1-2|+2^(-5+8)
=1-1+2^3
=8.