题目内容
脱式计算(能简算的简算).
(
+
-
)×48
1.25×64×2.5×0.5
693×99+693
÷[
×(
+
)].
(
| 1 |
| 8 |
| 5 |
| 12 |
| 1 |
| 6 |
1.25×64×2.5×0.5
693×99+693
| 9 |
| 20 |
| 1 |
| 2 |
| 2 |
| 5 |
| 4 |
| 5 |
(1)(
+
-
)×48,
=
×48+
×48-
×48,
=6+20-8,
=18;
(2)1.25×64×2.5×0.5,
=1.25×8×4×2×2.5×0.5,
=1.25×8×(4×2.5)×(2×0.5),
=10×10×1,
=100;
(3)693×99+693,
=(99+1)×693,
=100×693,
=69300;
(4)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
×
,
=
.
| 1 |
| 8 |
| 5 |
| 12 |
| 1 |
| 6 |
=
| 1 |
| 8 |
| 5 |
| 12 |
| 1 |
| 6 |
=6+20-8,
=18;
(2)1.25×64×2.5×0.5,
=1.25×8×4×2×2.5×0.5,
=1.25×8×(4×2.5)×(2×0.5),
=10×10×1,
=100;
(3)693×99+693,
=(99+1)×693,
=100×693,
=69300;
(4)
| 9 |
| 20 |
| 1 |
| 2 |
| 2 |
| 5 |
| 4 |
| 5 |
=
| 9 |
| 20 |
| 1 |
| 2 |
| 6 |
| 5 |
=
| 9 |
| 20 |
| 3 |
| 5 |
=
| 9 |
| 20 |
| 5 |
| 3 |
=
| 3 |
| 4 |
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