题目内容
脱式计算(能简算的要简算)
(1)
÷[(
-
)×
]
(2)
×25%-
÷4
(3)1.28×2.37-2.8×0.237
(4)(
+
)×12+
.
(1)
| 6 |
| 7 |
| 4 |
| 7 |
| 1 |
| 2 |
| 2 |
| 5 |
(2)
| 14 |
| 15 |
| 11 |
| 15 |
(3)1.28×2.37-2.8×0.237
(4)(
| 5 |
| 12 |
| 1 |
| 19 |
| 7 |
| 19 |
(1)
÷[(
-
)×
]
=
÷[
×
]
=
÷
=
×35
=30;
(2)
×25%-
÷4
=
×
-
×
=(
-
)×
=
×
=
;
(3)1.28×2.37-2.8×0.237
=1.28×2.37-0.28×2.37
=(1.28-0.28)×2.37
=1×2.37
=2.37;
(4)(
+
)×12+
=
×12+
×12+
=5+(
+
)
=5+1
=6.
| 6 |
| 7 |
| 4 |
| 7 |
| 1 |
| 2 |
| 2 |
| 5 |
=
| 6 |
| 7 |
| 1 |
| 14 |
| 2 |
| 5 |
=
| 6 |
| 7 |
| 1 |
| 35 |
=
| 6 |
| 7 |
=30;
(2)
| 14 |
| 15 |
| 11 |
| 15 |
=
| 14 |
| 15 |
| 1 |
| 4 |
| 11 |
| 15 |
| 1 |
| 4 |
=(
| 14 |
| 15 |
| 11 |
| 15 |
| 1 |
| 4 |
=
| 1 |
| 5 |
| 1 |
| 4 |
=
| 1 |
| 20 |
(3)1.28×2.37-2.8×0.237
=1.28×2.37-0.28×2.37
=(1.28-0.28)×2.37
=1×2.37
=2.37;
(4)(
| 5 |
| 12 |
| 1 |
| 19 |
| 7 |
| 19 |
=
| 5 |
| 12 |
| 1 |
| 19 |
| 7 |
| 19 |
=5+(
| 12 |
| 19 |
| 7 |
| 19 |
=5+1
=6.
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