1,1/2.1/3,1,1/9,2,( ),( )
计算.(能简算的要简算) 1.8/9×1/3+2/3 2.1除以(1/2+2/3) 3.5.5除以(1-1/8-2/3)
2,-1.-1,1,2 1,1,-2.1,4 4,-6,2,-2,4 3,6,-9,7,9 化为行最简形矩阵要过程
2,-1.-1,1,2 1,1,-2.1,4 4,-6,2,-2,4 3,6,-9,7,9 化为行最简形矩阵要过程 五个
1.1/2x-7=9x-2/6 2.1/5x-1/2(3-2x)=1
1/1*1+1/2*2.1/2008/2008
9(1)(2)(3)
|1-1/2|+|1/2-1/3|+|1/3-1/4|+...|1/9-1/10|
|1-1/2|-|1/2-1/3|-|1/3-1/4|-.-|1/9-1/10|
1/4-1/2-1/8)*128 中括号9*(-4)中括号*(-1/4) 2.25*(-2.3)-3/25 (-2.1)
/1/3-1/2/+/1/4-1/3/+/1/5-1/4/+.+/1/10-1/9/
解方程:1.2x/2x-1+x/x-2=2 2.1/2x+3+1/3-2x=4x/4x²-9
84÷63X3 1X5.3+2.1X6.2-2.1X1.5