题目内容
(1)计算:-22×0.125-[4÷(-
)2-
]+(-1)2011;
(2)先化简,再求值:3xy2-2(xy2-
x2y)+(3x2y-2xy2),其中x=-4,y=
.
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(2)先化简,再求值:3xy2-2(xy2-
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(1)原式=-4×0.125-(4÷
-
)-1=-
-9+
-1=-10;
(2)原式=3xy2-2xy2+3x2y+3x2y-2xy2=-xy2+6x2y,
当x=-4,y=
时,原式=-(-4)×(
)2+6×(-4)2×
=1+48=49.
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(2)原式=3xy2-2xy2+3x2y+3x2y-2xy2=-xy2+6x2y,
当x=-4,y=
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