计算(1)(?12)?(?314)+(+234)?(+512).(2)(?6)÷(?0.25)×1124.(3)?2+(1?0.2÷35)
计算(1)(?12)?(?314)+(+234)?(+512).(2)(?6)÷(?0.25)×1124.(3)?2+(1?0.2÷35)×(?3).(4)?14?16×...
计算(1)(?12)?(?314)+(+234)?(+512).(2)(?6)÷(?0.25)×1124.(3)?2+(1?0.2÷35)×(?3).(4)?14?16×[2?(?3)2].
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(1)(?
)?(?3
)+(+2
)?(+5
)
=(?
)+3
+2
+(?5
)
=[(-
)+(-5
)]+(3
+2
)
=(-6)+6
=0;
(2)(?6)÷(?0.25)×
=(-6)×(-4)×
=24×
=11;
(3)?2+(1?0.2÷
)×(?3)
=-2+(1-
×
)×(-3)
=-2+
×(-3)
=-2+(-2)
=-4;
(4)-14-
×[2-(-3)2]
=-1-
×[2+(-9)]
=-1-
×(-7)
=-1+
=
.
1 |
2 |
1 |
4 |
3 |
4 |
1 |
2 |
=(?
1 |
2 |
1 |
4 |
3 |
4 |
1 |
2 |
=[(-
1 |
2 |
1 |
2 |
1 |
4 |
3 |
4 |
=(-6)+6
=0;
(2)(?6)÷(?0.25)×
11 |
24 |
=(-6)×(-4)×
11 |
24 |
=24×
11 |
24 |
=11;
(3)?2+(1?0.2÷
3 |
5 |
=-2+(1-
1 |
5 |
5 |
3 |
=-2+
2 |
3 |
=-2+(-2)
=-4;
(4)-14-
1 |
6 |
=-1-
1 |
6 |
=-1-
1 |
6 |
=-1+
7 |
6 |
=
1 |
6 |
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