题目内容
7.5×
+2.5×
+10×
的值是多少.( )
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
| A.5 | B.12 | C.1 | D.10 |
7.5×
+2.5×
+10×
,
=
×(7.5+2.5)+10×
,
=
×10+10×
,
=10×(
+
),
=10;
故选:D.
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 4 |
=10×(
| 3 |
| 4 |
| 1 |
| 4 |
=10;
故选:D.
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