计算:1993+1992-1991-1990+1989+1988-1987-1986+…+5+4-3-2+1=_____
计算:1993+1992-1991-1990+1989+1988-1987-1986+…+5+4-3-2+1=_____
计算(3x-2)(1-2x)(-5x)=_____
一元二次方程解法有(1)_____(2)_____(3)_____(4)_____(5)_____
计算:3/14除以4/7=_____.
计算:11/12-(5/12-1/7)=_____
计算:1-2+3-4.+99-100=_____.
5x-2=3x+4 两边_____,根据_____得_____=3x+6.两边_____,根据_____得2x=____
计算:1996+1995-1994-1993+1992+1991-1990-1989+…+4+3-2-1,结果是____
请不要乱做.一.计算.4878493除以756757=_____(1)4645.54除以453.764=_____ (2
计算 1-2+3-4+5-6+...+1991-1992+1993
(+1)+(-2)+(+3)+(-4)+……+(+99)+(-100)=_____
1+2+3+4+5+6.+99=(_____)^2