题目内容
脱式计算,能进行简便运算的要简便.
(1)6.7×40.3÷1.25÷(67×0.8)
(2)3
×(
-
÷
)
(3)5
×2
-1.2×1
+12
(4)2.4×[3
÷(3+2.4×1
)]
(5)
+
+
+
+
.
(1)6.7×40.3÷1.25÷(67×0.8)
(2)3
| 4 |
| 15 |
| 5 |
| 7 |
| 3 |
| 14 |
| 3 |
| 4 |
(3)5
| 3 |
| 5 |
| 1 |
| 7 |
| 1 |
| 3 |
| 1 |
| 2 |
(4)2.4×[3
| 4 |
| 5 |
| 4 |
| 15 |
(5)
| 2 |
| 2×4 |
| 2 |
| 4×6 |
| 2 |
| 6×8 |
| 2 |
| 8×10 |
| 2 |
| 10×12 |
(1)6.7×40.3÷1.25÷(67×0.8),
=6.7×40.3÷1.25÷67÷0.8,
=(6.7÷67)×40.3÷(1.25×0.8),
=0.1×40.3÷1,
=4.03;
(2)3
×(
-
÷
),
=3
×(
-
),
=
×
,
=
;
(3)5
×2
-1.2×1
+12
,
=
×
-
×
+12
,
=12-1.6+12.5,
=22.9;
(4)2.4×[3
÷(3+2.4×1
)],
=2.4×[3
÷(3+
×
)],
=2.4×[3
÷(3+
)],
=2.4×[3
÷
],
=2.4×[
×
],
=
×
,
=
;
(5)
+
+
+
+
,
=
-
+
-
+
-
+
-
+
-
,
=
-
,
=
.
=6.7×40.3÷1.25÷67÷0.8,
=(6.7÷67)×40.3÷(1.25×0.8),
=0.1×40.3÷1,
=4.03;
(2)3
| 4 |
| 15 |
| 5 |
| 7 |
| 3 |
| 14 |
| 3 |
| 4 |
=3
| 4 |
| 15 |
| 5 |
| 7 |
| 2 |
| 7 |
=
| 49 |
| 15 |
| 3 |
| 7 |
=
| 7 |
| 5 |
(3)5
| 3 |
| 5 |
| 1 |
| 7 |
| 1 |
| 3 |
| 1 |
| 2 |
=
| 28 |
| 5 |
| 15 |
| 7 |
| 6 |
| 5 |
| 4 |
| 3 |
| 1 |
| 2 |
=12-1.6+12.5,
=22.9;
(4)2.4×[3
| 4 |
| 5 |
| 4 |
| 15 |
=2.4×[3
| 4 |
| 5 |
| 12 |
| 5 |
| 19 |
| 15 |
=2.4×[3
| 4 |
| 5 |
| 76 |
| 25 |
=2.4×[3
| 4 |
| 5 |
| 151 |
| 25 |
=2.4×[
| 19 |
| 5 |
| 25 |
| 151 |
=
| 12 |
| 5 |
| 95 |
| 151 |
=
| 228 |
| 151 |
(5)
| 2 |
| 2×4 |
| 2 |
| 4×6 |
| 2 |
| 6×8 |
| 2 |
| 8×10 |
| 2 |
| 10×12 |
=
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 10 |
| 1 |
| 10 |
| 1 |
| 12 |
=
| 1 |
| 2 |
| 1 |
| 12 |
=
| 5 |
| 12 |
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