|a-b| +|a|=_____(化简)x-xy=20,xy-y=-10,x-y=____,x+y-2xy=_____.
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|a-b|+|a|=_____(化简)x-xy=20,xy-y=-10,x-y=____,x+y-2xy=_____.|a-b|+|a|=_____(化简)x-xy=20,xy-y=-10,x-y=_
|a-b| +|a|=_____(化简)x-xy=20,xy-y=-10,x-y=____,x+y-2xy=_____.
|a-b| +|a|=_____(化简)x-xy=20,xy-y=-10,x-y=____,x+y-2xy=_____.
|a-b| +|a|=_____(化简)x-xy=20,xy-y=-10,x-y=____,x+y-2xy=_____.
=a-b+a=2a-b或=b-a+a=b
x-xy+xy-y=x-y=10
x+y-2xy=x-xy-(xy-y)=30
(a+b)=_____,(a-b)=_____.(填二次三项式)
a/b=a÷_____=a · _____=_____ · a=_____÷a
填空 (-a+ab-b)÷(a+b)=-1+_____“÷”为分数线
|a-b| +|a|=_____(化简)x-xy=20,xy-y=-10,x-y=____,x+y-2xy=_____.
若3a²+2|b-1|=0,则a=_____,b=_____
数学题|a|-a=0,|ab|=-ab,化简|b-a|-|a|=_____|a|-a=0,|ab|=-ab,化简|b-a|-|a|=_____ a考不考虑0?
当a=-5,b=-3又3/1时,(1)a-b=_____.(2)-a-b=_____.(3)-a-(-b)=_____.
若√(根号)a-2b+9和/a+b-1/互为相反数,a=_____ ,b=_____
分解因式 b-2ab+a²b=_____
如果a/b=3/4,且a+b=21,那么b-a=_____?
已知实数a,b满足√-a=b,化简|a|+2√(-b)^2-|3b-2a|=_____
已知a²+b²=5,(3a-2b)²-(3a+2b)²=-48,则a+b=_____
|a-3|=_____(a
已知a、b、c为常数,3x²-4x+9=a(x+b)²+c,则a=_____,b=_____,c=_____
若a≠0,且a与b为相反数,那么a+b=_____.
完全平方公式a*/16+ab/4+_____=(_____+1/2×b)*.(*为平方)
I have a headache.(对have a headache提问)_____ _____ _____ _____ _____?
( )He _____ a bike.A.needs.B.( )He _____ a bike.A.needs.B.is need