2x+x.2+x.4+1=100
1个回答
2x+x+0.2+x+0.4=99
4x+0.6=99
4x=98.4
x=24.4
相关问题
1x1+0x1+2x2+1x2+3x3+2x3+4x4+3x4……99x99+98x99+100x100+99x100
2X1-2+2X2-3+2X3-`4+2X4-5+…十2X99_100十2X100_101
1X1+2X2+3X3+4X4+5X5.+98X98+99X99+100X100=?
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
计算:1 1 1 1 1 ——+ ——+——+.+————+———— 1x2 2x3 3x4 99x100 100x10
求证:2/x2-1+4/x2-4+6/x2-9+…+20/x2-100=11/(x-1)(x+10)+…+11/(x-1
X1+X2+X3+X4+X5……+Xn的方差是S² 平均数是,则X1+100+X2+100+X3+100+X4
1x2+2x3+3x4+.99x100=?
1、 4x-2(100-x)=40
2(x-1)+3(4x-1)=9(x-1)+12 15(x-8)-4(2x+3)=6(6-x)-100 4(2x-1)-