题目内容
用递等式计算(能简算的要用简便方法计算).
①20-
-
②9.07×99+9.07
③
+
×
÷2
④2.3+3.91÷(22-19.7)
④
×[
-(
-
)].
①20-
| 7 |
| 18 |
| 11 |
| 18 |
②9.07×99+9.07
③
| 1 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
④2.3+3.91÷(22-19.7)
④
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
①20-
-
,
=20-(
+
),
=20-1,
=19;
②9.07×99+9.07,
=9.07×(99+1),
=9.07×100,
=907;
③
+
×
÷2,
=
+
÷2,
=
+
,
=
;
④2.3+3.91÷(22-19.7),
=2.3+3.91÷2.3,
=2.3+1.7,
=4;
⑤
×[
-(
-
)],
=
×[
-
],
=
×
,
=
.
| 7 |
| 18 |
| 11 |
| 18 |
=20-(
| 7 |
| 18 |
| 11 |
| 18 |
=20-1,
=19;
②9.07×99+9.07,
=9.07×(99+1),
=9.07×100,
=907;
③
| 1 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 6 |
| 1 |
| 2 |
=
| 1 |
| 6 |
| 1 |
| 4 |
=
| 5 |
| 12 |
④2.3+3.91÷(22-19.7),
=2.3+3.91÷2.3,
=2.3+1.7,
=4;
⑤
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 3 |
| 16 |
=
| 8 |
| 9 |
| 9 |
| 16 |
=
| 1 |
| 2 |
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