题目内容
| 计算下列各题,能简算的要简算: (1)(4800÷75+36)×12 | (2)
| (3)3.8×99+3.8 | ||||||||||
(4)42×
| (5)(
| (6)7.8-3.6+2.2-6.4. |
(1)(4800÷75+36)×12,
=(64+36)×12
=100×12,
=1200;
(2)
÷[
×(
-
)],
=
÷[
×(
-
)],
=
÷[
×
],
=
÷
,
=
×9,
=2;
(3)3.8×99+3.8,
=3.8×(99+1)
=3.8×100,
=380;
(4)42×
,
=(41+1)×
,
=41×
+
,
=40
;
(5)(
+
-
)÷
,
=
×24+
×24-
×24,
=12+16-6,
=22;
(6)7.8-3.6+2.2-6.4,
=7.8+2.2-(3.6+6.4),
=10-10,
=0.
=(64+36)×12
=100×12,
=1200;
(2)
| 2 |
| 9 |
| 5 |
| 6 |
| 4 |
| 5 |
| 2 |
| 3 |
=
| 2 |
| 9 |
| 5 |
| 6 |
| 12 |
| 15 |
| 10 |
| 15 |
=
| 2 |
| 9 |
| 5 |
| 6 |
| 2 |
| 15 |
=
| 2 |
| 9 |
| 1 |
| 9 |
=
| 2 |
| 9 |
=2;
(3)3.8×99+3.8,
=3.8×(99+1)
=3.8×100,
=380;
(4)42×
| 40 |
| 41 |
=(41+1)×
| 40 |
| 41 |
=41×
| 40 |
| 41 |
| 40 |
| 41 |
=40
| 40 |
| 41 |
(5)(
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 24 |
=
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 4 |
=12+16-6,
=22;
(6)7.8-3.6+2.2-6.4,
=7.8+2.2-(3.6+6.4),
=10-10,
=0.
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