题目内容
| 用递等式计算,能简算的要简算. ①5-5×
| ②15.5+5871÷103 | ③1.3×20%+7.7×20% | ||||||||||||||||||||
④(
| ⑤
| ⑥
|
①5-5×
+
=5-2+
,
=3
;
②15.5+5871÷103
=15.5+57,
=72.5;
③1.3×20%+7.7×20%
=(1.3+7.7)×20%,
=9×20%,
=1.8;
④(
+
)×
+70%
=(
+
)×
+70%,
=
×
+70%,
=0.35+0.7,
=1.05;
⑤
×[
-(
-
)]
=
×[
-
+
)],
=
×[
+
-
],
=
×[1-
],
=
×
,
=
;
⑥
×
+
÷8
=
×
+
×
,
=(
+
)×
,
=
×
,
=
.
| 2 |
| 5 |
| 3 |
| 5 |
=5-2+
| 3 |
| 5 |
=3
| 3 |
| 5 |
②15.5+5871÷103
=15.5+57,
=72.5;
③1.3×20%+7.7×20%
=(1.3+7.7)×20%,
=9×20%,
=1.8;
④(
| 4 |
| 5 |
| 1 |
| 4 |
| 1 |
| 3 |
=(
| 16 |
| 20 |
| 5 |
| 20 |
| 1 |
| 3 |
=
| 21 |
| 20 |
| 1 |
| 3 |
=0.35+0.7,
=1.05;
⑤
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 16 |
=
| 8 |
| 9 |
| 7 |
| 16 |
=
| 8 |
| 9 |
| 9 |
| 16 |
=
| 1 |
| 2 |
⑥
| 3 |
| 8 |
| 6 |
| 7 |
| 6 |
| 7 |
=
| 3 |
| 8 |
| 6 |
| 7 |
| 6 |
| 7 |
| 1 |
| 8 |
=(
| 3 |
| 8 |
| 1 |
| 8 |
| 6 |
| 7 |
=
| 1 |
| 2 |
| 6 |
| 7 |
=
| 3 |
| 7 |
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