题目内容
脱式计算,能简便计算的要简便计算.
2.5×(1.5+1.5+1.5+1.5)
0.125×32×25
÷
+
×
.
2.5×(1.5+1.5+1.5+1.5)
0.125×32×25
| 7 |
| 9 |
| 3 |
| 7 |
| 2 |
| 9 |
| 7 |
| 3 |
(1)2.5×(1.5+1.5+1.5+1.5)
=2.5×(1.5×4)
=(2.5×4)×1.5
=10×15
=15;
(2)0.125×32×25
=0.125×8×4×25
=(0.125×8)×(4×25)
=1×100
=100;
(3)
÷
+
×
=
×
+
×
=(
+
)×
=1×
=
.
=2.5×(1.5×4)
=(2.5×4)×1.5
=10×15
=15;
(2)0.125×32×25
=0.125×8×4×25
=(0.125×8)×(4×25)
=1×100
=100;
(3)
| 7 |
| 9 |
| 3 |
| 7 |
| 2 |
| 9 |
| 7 |
| 3 |
=
| 7 |
| 9 |
| 7 |
| 3 |
| 2 |
| 9 |
| 7 |
| 3 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 7 |
| 3 |
=1×
| 7 |
| 3 |
=
| 7 |
| 3 |
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