题目内容
脱式计算.
÷(50%×
÷
);
1
-[1÷(
+
)]×
;
2.87+5.6-0.87+4.4;
4.2-1.38-3.62.
| 20 |
| 29 |
| 6 |
| 29 |
| 3 |
| 20 |
1
| 4 |
| 5 |
| 3 |
| 4 |
| 1 |
| 3 |
| 13 |
| 9 |
2.87+5.6-0.87+4.4;
4.2-1.38-3.62.
(1)
÷(50%×
÷
),
=
÷(
×
×
),
=
÷
,
=1;
(2)1
-[1÷(
+
)]×
,
=1
-[1÷
]×
,
=1
-
×
,
=1
-
,
=
;
(3)2.87+5.6-0.87+4.4,
=(2.87-0.87)+(4.4+5.6),
=2+10,
=12;
(4)4.2-1.38-3.62,
=4.2-(1.38+3.62),
=4.2-5,
=-0.8.
| 20 |
| 29 |
| 6 |
| 29 |
| 3 |
| 20 |
=
| 20 |
| 29 |
| 1 |
| 2 |
| 6 |
| 29 |
| 20 |
| 3 |
=
| 20 |
| 29 |
| 20 |
| 29 |
=1;
(2)1
| 4 |
| 5 |
| 3 |
| 4 |
| 1 |
| 3 |
| 13 |
| 9 |
=1
| 4 |
| 5 |
| 13 |
| 12 |
| 13 |
| 9 |
=1
| 4 |
| 5 |
| 12 |
| 13 |
| 13 |
| 9 |
=1
| 4 |
| 5 |
| 4 |
| 3 |
=
| 7 |
| 15 |
(3)2.87+5.6-0.87+4.4,
=(2.87-0.87)+(4.4+5.6),
=2+10,
=12;
(4)4.2-1.38-3.62,
=4.2-(1.38+3.62),
=4.2-5,
=-0.8.
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