总述:本次共解1题。其中
☆算术计算1题
〖1/1算式〗
作业:求算式 tan(π/5)*tan(2*π/5)+tan(2*π/5)*tan(3*π/5)+tan(3*π/5)*tan(4*π/5) 的值.
题型:数学计算
解:
tan(π/5)*tan(2*π/5)+tan(2*π/5)*tan(3*π/5)+tan(3*π/5)*tan(4*π/5)
=tan0.628319*tan(2*π/5)+tan(2*π/5)*tan(3*π/5)+tan(3*π/5)*tan(4*π/5)
=tan0.628319*tan1.256637+tan(2*π/5)*tan(3*π/5)+tan(3*π/5)*tan(4*π/5)
=tan0.628319*tan1.256637+tan1.256637*tan(3*π/5)+tan(3*π/5)*tan(4*π/5)
=tan0.628319*tan1.256637+tan1.256637*tan1.884956+tan(3*π/5)*tan(4*π/5)
=tan0.628319*tan1.256637+tan1.256637*tan1.884956+tan1.884956*tan(4*π/5)
=tan0.628319*tan1.256637+tan1.256637*tan1.884956+tan1.884956*tan2.513274
=0.726543*tan1.256637+tan1.256637*tan1.884956+tan1.884956*tan2.513274
=0.726543*3.077683+tan1.256637*tan1.884956+tan1.884956*tan2.513274
=0.726543*3.077683+3.077683*tan1.884956+tan1.884956*tan2.513274
=0.726543*3.077683+3.077683*-3.077679+tan1.884956*tan2.513274
=0.726543*3.077683+3.077683*-3.077679+-3.077679*tan2.513274
=0.726543*3.077683+3.077683*-3.077679+-3.077679*-0.726543
=2.236069+3.077683*(-3.077679)+(-3.077679)*(-0.726543)
=2.236069+(-9.47212)+(-3.077679)*(-0.726543)
=2.236069+-9.47212+2.236066
=-7.236051+2.236066
=-4.999985 答案:tan(π/5)*tan(2*π/5)+tan(2*π/5)*tan(3*π/5)+tan(3*π/5)*tan(4*π/5)=-4.999985 注:弧度制你的问题在这里没有得到解决?请到 热门难题 里面看看吧!