题目内容
| 看谁算得巧. ①75.5-8.25-12.75 | ②
| ③43-43×0.9 | ④
|
①75.5-8.25-12.75
=75.5-(8.25+12.75),
=75.5-21,
=54.5;
②
÷[
×(0.5+
)]
=
÷[
×(0.5+0.8)],
=
÷[
×
],
=
÷
÷
,
=
×
×
,
=
;
③43-43×0.9,
=(1-0.9)×43,
=0.1×43,
=4.3;
④
÷
-
×6
=
×6-
×6,
=(
-
)×6,
=
.
=75.5-(8.25+12.75),
=75.5-21,
=54.5;
②
| 9 |
| 20 |
| 3 |
| 2 |
| 4 |
| 5 |
=
| 9 |
| 20 |
| 3 |
| 2 |
=
| 9 |
| 20 |
| 3 |
| 2 |
| 13 |
| 10 |
=
| 9 |
| 20 |
| 3 |
| 2 |
| 13 |
| 10 |
=
| 9 |
| 20 |
| 2 |
| 3 |
| 10 |
| 13 |
=
| 3 |
| 13 |
③43-43×0.9,
=(1-0.9)×43,
=0.1×43,
=4.3;
④
| 8 |
| 15 |
| 1 |
| 6 |
| 7 |
| 15 |
=
| 8 |
| 15 |
| 7 |
| 15 |
=(
| 8 |
| 15 |
| 7 |
| 15 |
=
| 2 |
| 5 |
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