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a+2a-2-a-2a+2-8aa2-4=______.
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It"s already 10 o"clock I wonder how it _______ that she was two hours late on such a short trip.
A. came overB. came outC: came aboutD. came up
A. came overB. came outC: came aboutD. came up
计算:5(a2b-3ab2)-2(2a2b-7ab2)
下列运算正确的是
A.x3?x2=x6B.3a2+2a2=5a2C.a(a﹣1)=a2﹣1D.(a3)4=a7
A.x3?x2=x6B.3a2+2a2=5a2C.a(a﹣1)=a2﹣1D.(a3)4=a7
关于x的方程2x+12=a的解为负数,a的取值范围是______.
若52x+1=125,求(x-2)2009+x的值。