题目内容
运用运算定律或性质简算
99×7.8
4
+3.44+6
+5
10.26-(3.78+4.26)
99×7.8
4
| 5 |
| 12 |
| 7 |
| 12 |
| 14 |
| 15 |
10.26-(3.78+4.26)
(1)99×7.8,
=(100-1)×7.8,
=100×7.8-1×7.8,
=780-7.8,
=772.2;
(2)4
+3.44+6
+5
,
=(4
+6
)+(3
+5
),
=11+9
,
=20
;
(3)10.26-(3.78+4.26),
=10.26-4.26-3.78,
=6-3.78,
=2.22.
=(100-1)×7.8,
=100×7.8-1×7.8,
=780-7.8,
=772.2;
(2)4
| 5 |
| 12 |
| 7 |
| 12 |
| 14 |
| 15 |
=(4
| 5 |
| 12 |
| 7 |
| 12 |
| 11 |
| 25 |
| 14 |
| 15 |
=11+9
| 28 |
| 75 |
=20
| 28 |
| 75 |
(3)10.26-(3.78+4.26),
=10.26-4.26-3.78,
=6-3.78,
=2.22.
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