计算:(1)25÷(?225)?821×(?134)?0.5÷2×12;(2)?5?[(?2)
计算:(1)25÷(?225)?821×(?134)?0.5÷2×12;(2)?5?[(?2)3+(1?0.8×34)÷(?2)];(3)?0.52+14?|?22?4|...
计算:(1)25÷(?225)?821×(?134)?0.5÷2×12;(2)?5?[(?2)3+(1?0.8×34)÷(?2)];(3)?0.52+14?|?22?4|?(?112)3×1627.
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(1)
÷(?2
)?
×(?1
)?0.5÷2×
=
×(-
)+
×
-
×
×
=-
+
-
=
;
(2)?5?[(?2)3+(1?0.8×
)÷(?2)]
=-5-[-8+(1-0.6)÷(-2)]
=-5-[-8+0.4÷(-2)]
=-5-[-8-0.2)]
=-5+8.2
=3.2;
(3)?0.52+
?|?22?4|?(?1
)3×
=-
+
-|-4-4|+
×
=-8+2
=-6.
2 |
5 |
2 |
5 |
8 |
21 |
3 |
4 |
1 |
2 |
=
2 |
5 |
5 |
12 |
8 |
21 |
7 |
4 |
1 |
2 |
1 |
2 |
1 |
2 |
=-
1 |
6 |
2 |
3 |
1 |
8 |
=
3 |
8 |
(2)?5?[(?2)3+(1?0.8×
3 |
4 |
=-5-[-8+(1-0.6)÷(-2)]
=-5-[-8+0.4÷(-2)]
=-5-[-8-0.2)]
=-5+8.2
=3.2;
(3)?0.52+
1 |
4 |
1 |
2 |
16 |
27 |
=-
1 |
4 |
1 |
4 |
27 |
8 |
16 |
27 |
=-8+2
=-6.
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