化简:+(-8)= -[-(-2)]= -[-(+2)]=
化简:+(-8)= -[-(-2)]= -[-(+2)]=
2-3(x-1)=1-2(1+0.5x)
解方程.(x-2)(x-3)+(2-x)² -(x-2)(2x-3)=20
简化下例各数符号数学+(-2)= -(+1/3)= -(-2.5)= +(+3.14)
14+(-4)+(-2)+26+(-3)=?(-83)+26+(-41)+15=?
2(ax+by)(by-ax)-(ax+by)²-(ax-by)²,其中a=-4,x=-1/8 先化
化简:1/6a-1/2(a+1)+1/3(a-1)=
(-32)+68+(-29)+(-68)=
已知X²-5X-2000=0,求(X-2)³-(X-1)²+1/X-2的值
17-8÷(-2)+4(-5)=?2方×(5-7)÷(-2分之1)+3×(-2)方等于?
化简:f(a)=tan(-α-π)sin(-α-π)分之sin(α-2分之π)cos(2分之3π+α)tan(π-α)
化简 = = (4ab-b的平方)-2(a的平方+2ab-b的平方)