7/5-9/4x5/7怎样计算?

7/5-9/4x5/7怎样计算? (-3)x5/6x(-9/5)x(-1/4)计算 简便计算 1.5x5/8+7x5/8=?2.3/4x5/7-3/4x1/7=?3.7/8x3/17x5/7=?4.11/19x2/7x5/11没分给对不起啊、、 6分之5x5分之3+7分之4+7分之3,简便计算 请问怎样理解个人所得税EXCEL计算公式公式为 =MAX((X5-2000)*0.05*{1,2,3,4,5,6,7,8,9}-25*{0,1,5,15,55,135,255,415,615},0)A1为工资数 5x5%如何计算 matlab线性方程组计算X1+X2-5X3-X4+X5=98X1+5X2-X3+4X5=23X1-7X2-5X3-X4+X5=42X1+X2+8X3+3X4-X5=-86X2+2X3+7X4-2X5=15 4X5+5x4+5一9一7 用简便方法计算!2/7x5/9x（36x28） 7/9÷13/5+2/9x5/13（5/6-7/12x15/14）÷5/4 26/21-1/5-8/9÷10/9 36X3/4+3/4X63+3/4 4/9X(130X26)X5/26 5/7+3/4X5/6-3/8 20-35X(2/5-1/7) 2008X2006/2007用最简便方法计算 4/5x1/3+4/5、1/4x5-1/4,4/7+4/7x6,用简便方法计算 数学简便计算-32x4/3x3/2=?10/9X6/5x5/4=?7/3x14x9/2=?18/25x15/4x20/9=? 计算：1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10. 2/1x3+2/3X5+2/5x7=2/7x9+2/9x11计算.. 1x5+2x5+3x5+4x5+5x5… 麻烦给我一个公式. 求方程组x1+3x2+x3+2x4+4x5=3 2x1-x2+8x3+7x4+2x5=9 4x1+5x2+6x3+11x4+10x5=15的全部解线性代数 7/17x5/8+5/17x1/8简便计算,教教我! 计算全部过程（4分之3减10分之7）X5