题目内容
你认为怎样算简便就怎样算.
①(
+
)÷(
-
)
②[19.8-(4.9+9.8)]×(1÷0.01)
③155×360×77÷90÷11÷31
④1÷28×72-27×
-17÷28.
①(
| 1 |
| 6 |
| 1 |
| 5 |
| 7 |
| 8 |
| 5 |
| 12 |
②[19.8-(4.9+9.8)]×(1÷0.01)
③155×360×77÷90÷11÷31
④1÷28×72-27×
| 1 |
| 28 |
①(
+
)÷(
-
),
=
÷
,
=
×
,
=
;
②[19.8-(4.9+9.8)]×(1÷0.01),
=[19.8-14.7]×100,
=5.1×100,
=510;
③155×360×77÷90÷11÷31,
=(155÷31)×(360÷90)×(77÷11),
=5×4×7,
=140;
④1÷28×72-27×
-17÷28,
=
×72-27×
-17×
,
=
×(72-27-17),
=
×28,
=1.
| 1 |
| 6 |
| 1 |
| 5 |
| 7 |
| 8 |
| 5 |
| 12 |
=
| 11 |
| 30 |
| 11 |
| 24 |
=
| 11 |
| 30 |
| 24 |
| 11 |
=
| 4 |
| 5 |
②[19.8-(4.9+9.8)]×(1÷0.01),
=[19.8-14.7]×100,
=5.1×100,
=510;
③155×360×77÷90÷11÷31,
=(155÷31)×(360÷90)×(77÷11),
=5×4×7,
=140;
④1÷28×72-27×
| 1 |
| 28 |
=
| 1 |
| 28 |
| 1 |
| 28 |
| 1 |
| 28 |
=
| 1 |
| 28 |
=
| 1 |
| 28 |
=1.
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