设顶角为x度
65*2+x=180
130+x=180
130+x-130=180-130
x=50
0.45*3*2.5
=1.35*2.5
=3.275(吨)
(6.8+35.6+6+5.2+3.6+2)/6
=(42.4+6+5.2+3.6+2)/6
=(48.4+5.2+3.6+2)/6
=(53.6+3.6+2)/6
=(57.2+2)/6
=59.2/6
≈9.87(千克)
1 180-65*2=50
2 0.45*3*0.25=
3 (6.8+35.6+6+5.2+3.6+2.0)/6
1 X+65*2=180
2 0.45*3*0.25=0.3375
3 (6.8+35.6+6+5.2+3.6+2.0)/6=9.87
1,等腰的两个底脚相等,3角之和等于180.
设顶角为x度,x+65*2=180,=> x= 50.
2,0.45*3*2.5=3.375吨
3,(6.8+35.6+6.0+5.2+3.6+2.0)/6 = 59.2/6 ≈9.87元/千克
1.180-65-65=50°或(180-65)/2=57.5°
2.3*2.5*(0.45/1/1)=3.375(吨)
3.(1)(6.8+35.6+6.0+5.2+3.6+2.0)/6=9.87(元/千克)