题目内容
| 用简便方法计算. 7.26-2.38+12.74-7.62 | 67÷
|
| ||||||||||
87×
| 51×3.2+32×4.9. |
(1)7.26-2.38+12.74-7.62,
=(7.26+12.74)-(2.38+7.62),
=20-10,
=10;
(2)67÷
÷12.5,
=67÷(
×12.5),
=67÷10,
=6.7;
(3)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)87×
,
=(88-1)×
,
=88×
-
,
=87-
,
=86
;
(5)51×3.2+32×4.9,
=51×3.2+3.2×49,
=(51+49)×3.2,
=100×3.2,
=320.
=(7.26+12.74)-(2.38+7.62),
=20-10,
=10;
(2)67÷
| 4 |
| 5 |
=67÷(
| 4 |
| 5 |
=67÷10,
=6.7;
(3)
| 7 |
| 13 |
| 9 |
| 17 |
| 9 |
| 17 |
| 6 |
| 13 |
=(
| 7 |
| 13 |
| 6 |
| 13 |
| 9 |
| 17 |
=1×
| 9 |
| 17 |
=
| 9 |
| 17 |
(4)87×
| 87 |
| 88 |
=(88-1)×
| 87 |
| 88 |
=88×
| 87 |
| 88 |
| 87 |
| 88 |
=87-
| 87 |
| 88 |
=86
| 1 |
| 88 |
(5)51×3.2+32×4.9,
=51×3.2+3.2×49,
=(51+49)×3.2,
=100×3.2,
=320.
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