题目内容
| 计算题 ①(9.18×
| ②7.8÷[32×(1-
| ③1-(+4)-(-
| ||||||||||||
④6.5×8+4
| ⑤12×(
| ⑥78+209+122+491-258-42. |
①(9.18×
-2
)÷
=(3.06-2.5)÷
,
=0.56×
,
=
×
,
=
;
②7.8÷[32×(1-
)+3.6]
=7.8÷[32-32×
+3.6],
=7.8÷[32-20+3.6],
=7.8÷15.6,
=0.5;
③1-(+4)-(-
)+(-2
)
=-3+
-2
,
=-
-
,
=-5
;
④6.5×8+4
×8-8
=6.5×8+4
×8-8×1,
=(6.5+4
-1)×8,
=10×8,
=80;
⑤12×(
+
-
)
=12×
+12×
-12×
,
=3+2-4,
=5-4,
=1;
⑥78+209+122+491-258-42
=(78+122)+(209+491)-(258+42)
=200+700-300,
=900-300,
=600.
| 1 |
| 3 |
| 1 |
| 2 |
| 11 |
| 15 |
=(3.06-2.5)÷
| 11 |
| 15 |
=0.56×
| 15 |
| 11 |
=
| 14 |
| 25 |
| 15 |
| 11 |
=
| 42 |
| 55 |
②7.8÷[32×(1-
| 5 |
| 8 |
=7.8÷[32-32×
| 5 |
| 8 |
=7.8÷[32-20+3.6],
=7.8÷15.6,
=0.5;
③1-(+4)-(-
| 1 |
| 3 |
| 1 |
| 2 |
=-3+
| 1 |
| 3 |
| 1 |
| 2 |
=-
| 8 |
| 3 |
| 5 |
| 2 |
=-5
| 1 |
| 6 |
④6.5×8+4
| 1 |
| 2 |
=6.5×8+4
| 1 |
| 2 |
=(6.5+4
| 1 |
| 2 |
=10×8,
=80;
⑤12×(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=12×
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=3+2-4,
=5-4,
=1;
⑥78+209+122+491-258-42
=(78+122)+(209+491)-(258+42)
=200+700-300,
=900-300,
=600.
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