
计算:(1)(-81)÷214-49÷(-2)4 (2)-14+25×34-(-25)×12+25×(-14
计算:(1)(-81)÷214-49÷(-2)4(2)-14+25×34-(-25)×12+25×(-14)...
计算:(1)(-81)÷214-49÷(-2)4 (2)-14+25×34-(-25)×12+25×(-14)
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(1)原式=-81×
-
×
=-36-
=-36
;
(2)原式=-1+25×
+25×
-25×
=-1+25×(
+
-
)
=-1+25
=24.
4 |
9 |
4 |
9 |
1 |
16 |
=-36-
1 |
36 |
=-36
1 |
36 |
(2)原式=-1+25×
3 |
4 |
1 |
2 |
1 |
4 |
=-1+25×(
3 |
4 |
2 |
4 |
1 |
4 |
=-1+25
=24.
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