题目内容
| 计算下列各题 (1)15×
| (2)1200-840÷24 | (3)3+1.5÷2.5÷4 | ||||||||||||
| (4)8-4.4×0.25 | (5)
| (6)(
|
(1)15×
÷
=15×
×
,
=18×
,
=14;
(2)1200-840÷24
=1200-35,
=1165;
(3)3+1.5÷2.5÷4
=3+1.5÷(2.5×4),
=3+1.5÷10,
=3+0.15,
=3.15;
(4)8-4.4×0.25
=8-1.1×(4×0.25),
=8-1.1×1,
=8-1.1,
=6.9;
(5)
-(
-
)
=
-
,
=
;
(6)(
-
)×12÷
.
=(
×12-
×12)×
,
=(9-4)×
,
=5×
,
=6.
| 7 |
| 9 |
| 5 |
| 6 |
=15×
| 6 |
| 5 |
| 7 |
| 9 |
=18×
| 7 |
| 9 |
=14;
(2)1200-840÷24
=1200-35,
=1165;
(3)3+1.5÷2.5÷4
=3+1.5÷(2.5×4),
=3+1.5÷10,
=3+0.15,
=3.15;
(4)8-4.4×0.25
=8-1.1×(4×0.25),
=8-1.1×1,
=8-1.1,
=6.9;
(5)
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 8 |
=
| 3 |
| 4 |
| 11 |
| 24 |
=
| 7 |
| 24 |
(6)(
| 3 |
| 4 |
| 1 |
| 3 |
| 5 |
| 6 |
=(
| 3 |
| 4 |
| 1 |
| 3 |
| 6 |
| 5 |
=(9-4)×
| 6 |
| 5 |
=5×
| 6 |
| 5 |
=6.
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