题目内容
计算:(2+
)(2-
)2+(
)0+
-2(cos30°+sin30°)+(0.5)-1.
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原式=(2-
)+1÷2
-2(
+
)+2(3分)
=(2+1-1+2)+(2
-
-2×
)(5分)
=4.(6)
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=(2+1-1+2)+(2
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=4.(6)
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