题目内容
脱式计算(能简算的要写出简算过程.)
-
+
+0.4
16
÷8
(6.9-3.15)÷0.3×0.8
2.5×(1.9+1.9+1.9+1.9)
| 3 |
| 7 |
| 3 |
| 5 |
| 4 |
| 7 |
16
| 8 |
| 9 |
(6.9-3.15)÷0.3×0.8
2.5×(1.9+1.9+1.9+1.9)
(1)
-
+
+0.4
=
+
-
+
,
=1-
+
,
=
;
(2)16
÷8
=(16+
)×
,
=16×
+
×
,
=2+
,
=2
;
(3)(6.9-3.15)÷0.3×0.8
=3.75÷0.3×0.8,
=12.5×0.8,
=10;
(4)2.5×(1.9+1.9+1.9+1.9)
=2.5×(4×1.9),
=2.5×4×1.9,
=10×1.9,
=19.
| 3 |
| 7 |
| 3 |
| 5 |
| 4 |
| 7 |
=
| 3 |
| 7 |
| 4 |
| 7 |
| 3 |
| 5 |
| 2 |
| 5 |
=1-
| 3 |
| 5 |
| 2 |
| 5 |
=
| 4 |
| 5 |
(2)16
| 8 |
| 9 |
=(16+
| 8 |
| 9 |
| 1 |
| 8 |
=16×
| 1 |
| 8 |
| 8 |
| 9 |
| 1 |
| 8 |
=2+
| 1 |
| 9 |
=2
| 1 |
| 9 |
(3)(6.9-3.15)÷0.3×0.8
=3.75÷0.3×0.8,
=12.5×0.8,
=10;
(4)2.5×(1.9+1.9+1.9+1.9)
=2.5×(4×1.9),
=2.5×4×1.9,
=10×1.9,
=19.
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