题目内容
怎样算简便就怎样算.
①520+2613÷13
②
×5×
③(
+
)÷
+
④(
+
-
)÷
⑤
÷62.5%+
×
.
①520+2613÷13
②
| 2 |
| 9 |
| 9 |
| 20 |
③(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 5 |
| 1 |
| 4 |
④(
| 2 |
| 3 |
| 4 |
| 7 |
| 1 |
| 6 |
| 1 |
| 42 |
⑤
| 7 |
| 11 |
| 4 |
| 11 |
| 8 |
| 5 |
①520+2613÷13,
=520+201,
=721;
②
×5×
,
=
×
×5,
=
×5,
=
;
③(
+
)÷
+
,
=
÷
+
,
=
+
,
=1;
④(
+
-
)÷
,
=(
+
-
)×42,
=
×42+
×42-
×42,
=28+24-7,
=52-7,
=45;
⑤
÷62.5%+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
=520+201,
=721;
②
| 2 |
| 9 |
| 9 |
| 20 |
=
| 2 |
| 9 |
| 9 |
| 20 |
=
| 1 |
| 10 |
=
| 1 |
| 2 |
③(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 5 |
| 1 |
| 4 |
=
| 21 |
| 20 |
| 7 |
| 5 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 4 |
=1;
④(
| 2 |
| 3 |
| 4 |
| 7 |
| 1 |
| 6 |
| 1 |
| 42 |
=(
| 2 |
| 3 |
| 4 |
| 7 |
| 1 |
| 6 |
=
| 2 |
| 3 |
| 4 |
| 7 |
| 1 |
| 6 |
=28+24-7,
=52-7,
=45;
⑤
| 7 |
| 11 |
| 4 |
| 11 |
| 8 |
| 5 |
=
| 7 |
| 11 |
| 8 |
| 5 |
| 4 |
| 11 |
| 8 |
| 5 |
=(
| 7 |
| 11 |
| 4 |
| 11 |
| 8 |
| 5 |
=1×
| 8 |
| 5 |
=
| 8 |
| 5 |
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