6.48/[(0.5+0.4)*0.6] 要简便
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6.48/[(0.5+0.4)*0.6]要简便6.48/[(0.5+0.4)*0.6]要简便6.48/[(0.5+0.4)*0.6]要简便=6.48÷0.6÷(0.5+0.4)=10.8÷0.9=12
6.48/[(0.5+0.4)*0.6] 要简便
6.48/[(0.5+0.4)*0.6] 要简便
6.48/[(0.5+0.4)*0.6] 要简便
=6.48÷0.6÷(0.5+0.4)
=10.8÷0.9
=12
设为P(x,y),半径r
C1(0,0),r1=1
C2(6,0),r2=3
外切则PC1=r+r1
PC2=r+r2
相减
PC2-PC1=2
所以是双曲线
C1C2=6,所以2c=6,c=3
2a=2,a=1
则b2=8
中心是C1C2中点(3,0)
所以是(x-3)2-y2/8=1
6.48/[(0.5+0.4)*0.6] 要简便
0.648/[(0.4+0.5)*0.6] 简便
简便的要简便 605÷55+106×27327×68-327+327×33 6.02×2.7+2.7×3.98 1.9×【25-（8.7）-3.7）】37.5+9.1÷（3.3-2.6）6.48÷【（0.5+0.4）×0.6】
0.4x-2.1/0.5-0.5-0.2x/0.03=0.6
(+0.2)+(-0.2)+(+0.7)+(-0.3)+(-0.4)+(+0.6)+0+(-0.1)+(-0.6)+(+0.5)+(-0.2)+(-0.5)=?(+0.2)+(-0.2)+(+0.7)+(-0.3)+(-0.4)+(+0.6)+0+(-0.1)+(-0.6)+(+0.5)+(-0.2)+(-0.5)=?
巧算:0.1+0.2+0.3+0.4+0.5+0.6+0.7+0.8+0.9
0.1+0.3+0.5+0.7+..+2.9-0.2-0.4-0.6-...-2.
0.1-0.2+0.3-0.4+0.5-0.6+.+9.9-10+10.1巧算
(0.4+2.2×0.5﹚×0.6递等式计算
0.4和0.6之间只有一个一位小数0.5.对错
(0.2+0.4+0.6+...+9.8+10)-(+0.1+0.3+0.5+...+9.7+9.9)
x/0.5-0.4x-0.6/0.2=2(-x+3)
(0.4x-2.1)/0.5=(0.1+0.2x)/0.03-0.6
(0.4x-2.1)/0.5=(0.1+0.2x)/0.03-0.6
2.1,0.4,0.5,1.5,0.6,后面怎么填
0.5+3(1-0.2X)> 0.4X-0.6
数学建模的lingo软件怎么用LINGO软件编程：MIN=X1+X2+X3+X4+X5;X1*(2*0.6+0.4)>100000*0.2*0.5;x2*(2*0.6+0.4)>100000*0.1*0.5;x3*(2*0.6+0.4)>100000*0.05*0.5;x4*(2*0.6+0.4)>100000*0.025*0.5;x5*(2*0.6+0.4)>100000*0.01*0.5;endgin 5需要：从
解方程:x-2+0.4x/0.6=1-(0.5x-1)/0.5