计算:(1)(?37+13?914)÷(?142)(2)?14?(1?0.5)×13×[2?(?3)2](3)|-5-4|-(-5)×(-2)2-1÷(-3
计算:(1)(?37+13?914)÷(?142)(2)?14?(1?0.5)×13×[2?(?3)2](3)|-5-4|-(-5)×(-2)2-1÷(-3)(4)(-2...
计算:(1)(?37+13?914)÷(?142)(2)?14?(1?0.5)×13×[2?(?3)2](3)|-5-4|-(-5)×(-2)2-1÷(-3)(4)(-2x2+3x)-[5x-(2x2+1)-x2].
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2015-01-13
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(1)
(?+?)÷(?),
=(-
+?)×(-42),
=18-14+27,
=31;
(2)
?14?(1?0.5)××[2?(?3)2],
=-1-
××(?7),
=-1+
,
=
;
(3)|-5-4|-(-5)×(-2)
2-1÷(-3),
=9-(-5)×4-(-3),
=9+20+3,
=32;
(4)(-2x
2+3x)-[5x-(2x
2+1)-x
2],
=-2x
2+3x-5x+2x
2+1+x
2,
=x
2-2x+1.
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