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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(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)(-2x2+3x)-[5x-(2x2+1)-x2],
=-2x2+3x-5x+2x2+1+x2,
=x2-2x+1.
3 |
7 |
1 |
3 |
9 |
14 |
1 |
42 |
=(-
3 |
7 |
1 |
3 |
9 |
14 |
=18-14+27,
=31;
(2)?14?(1?0.5)×
1 |
3 |
=-1-
1 |
2 |
1 |
3 |
=-1+
7 |
6 |
=
1 |
6 |
(3)|-5-4|-(-5)×(-2)2-1÷(-3),
=9-(-5)×4-(-3),
=9+20+3,
=32;
(4)(-2x2+3x)-[5x-(2x2+1)-x2],
=-2x2+3x-5x+2x2+1+x2,
=x2-2x+1.
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