题目内容
计算或化简求值:
(1)计算:-14+3×(-2)3-5÷(-
)
(2)化简求值:x-2(
x-
y2)+(-
x+
y2),其中x=1,y=-
.
(1)计算:-14+3×(-2)3-5÷(-
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(2)化简求值:x-2(
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(1)原式=-1+3×(-8)-5×(-2)
=-1-24+10
=-15;
(2)原式=x-
x+
y2-
x+
y2
=y2,
当x=1,y=-
时,原式=(-
)2=
.
=-1-24+10
=-15;
(2)原式=x-
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=y2,
当x=1,y=-
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