(1)计算:|-5|+
+2
-1-sin30°;
(2)计算:(x-y+
)( x+y-
).
人气:397 ℃ 时间:2020-01-26 04:07:35
解答
(1)原式=5+2+
−=7;
(2)原式=
•=
•=x2−y2.
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