题目内容
神机妙算细又巧!(写出简算过程)
×[
÷(
-
)]
17×(
+
)×15
0.25×32×1.25.
| 3 |
| 8 |
| 8 |
| 9 |
| 5 |
| 6 |
| 3 |
| 4 |
17×(
| 1 |
| 15 |
| 2 |
| 17 |
0.25×32×1.25.
(1)
×[
÷(
-
)]
=
×[
÷
]
=
×
=4;
(2)17×(
+
)×15
=15×
×17+17×
×15
=17+30
=47;
(3)0.25×32×1.25
=0.25×(4×8)×1.25
=(0.25×4)×(8×1.25)
=1×10
=10.
| 3 |
| 8 |
| 8 |
| 9 |
| 5 |
| 6 |
| 3 |
| 4 |
=
| 3 |
| 8 |
| 8 |
| 9 |
| 1 |
| 12 |
=
| 3 |
| 8 |
| 32 |
| 3 |
=4;
(2)17×(
| 1 |
| 15 |
| 2 |
| 17 |
=15×
| 1 |
| 15 |
| 2 |
| 17 |
=17+30
=47;
(3)0.25×32×1.25
=0.25×(4×8)×1.25
=(0.25×4)×(8×1.25)
=1×10
=10.
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