题目内容
能简算的要简算
2.9÷8+1.1×
×8×
×1.25
(
+
)×28
(
÷3-
)×
.
2.9÷8+1.1×
| 1 |
| 8 |
| 13 |
| 5 |
| 8 |
| 13 |
(
| 1 |
| 4 |
| 5 |
| 7 |
(
| 3 |
| 4 |
| 1 |
| 10 |
| 1 |
| 3 |
(1)2.9÷8+1.1×
,
=(2.9+1.1)×
,
=4×
,
=
;
(2)
×8×
×1.25,
=(
×
)×(8×1.25),
=1.6×10,
=16;
(3)(
+
)×28,
=
×28+
×28,
=7+20,
=27;
(4)(
÷3-
)×
,
=(
×
-
)×
,
=
×
,
=
.
| 1 |
| 8 |
=(2.9+1.1)×
| 1 |
| 8 |
=4×
| 1 |
| 8 |
=
| 1 |
| 2 |
(2)
| 13 |
| 5 |
| 8 |
| 13 |
=(
| 13 |
| 5 |
| 8 |
| 13 |
=1.6×10,
=16;
(3)(
| 1 |
| 4 |
| 5 |
| 7 |
=
| 1 |
| 4 |
| 5 |
| 7 |
=7+20,
=27;
(4)(
| 3 |
| 4 |
| 1 |
| 10 |
| 1 |
| 3 |
=(
| 3 |
| 4 |
| 1 |
| 3 |
| 1 |
| 10 |
| 1 |
| 3 |
=
| 3 |
| 20 |
| 1 |
| 3 |
=
| 1 |
| 20 |
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