题目内容
| 运用你学过的方法算 1
|
| (
| ||||||||||||||||||
(
| 1
|
(1)1
-0.25+
,
=1.4-0.25+0.35,
=1.15+0.35,
=1.5;
(2)
×7
+3
×
-0.6,
=
×7
+3
×
-
×1,
=
×(7
+3
-1),
=
×(11-1),
=
×10,
=6;
(3)(
+1÷
)÷2
,
=(
+
)×
,
=
×
,
=
;
(4)(
+
)×12×24,
=(
+
)×24×12,
=(
×24+
×24)×12,
=(4+9)×12,
=4×12+9×12,
=48+108,
=156;
(5)1
÷[(2
-1
)×
+
],
=1
÷[1
×
+
],
=1
÷[
×
+
],
=1
÷[
+
],
=
÷
,
=
.
| 2 |
| 5 |
| 7 |
| 20 |
=1.4-0.25+0.35,
=1.15+0.35,
=1.5;
(2)
| 3 |
| 5 |
| 3 |
| 5 |
| 2 |
| 5 |
| 3 |
| 5 |
=
| 3 |
| 5 |
| 3 |
| 5 |
| 2 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
=
| 3 |
| 5 |
| 3 |
| 5 |
| 2 |
| 5 |
=
| 3 |
| 5 |
=
| 3 |
| 5 |
=6;
(3)(
| 1 |
| 4 |
| 2 |
| 7 |
| 1 |
| 7 |
=(
| 1 |
| 4 |
| 7 |
| 2 |
| 7 |
| 15 |
=
| 15 |
| 4 |
| 7 |
| 15 |
=
| 7 |
| 4 |
(4)(
| 1 |
| 6 |
| 3 |
| 8 |
=(
| 1 |
| 6 |
| 3 |
| 8 |
=(
| 1 |
| 6 |
| 3 |
| 8 |
=(4+9)×12,
=4×12+9×12,
=48+108,
=156;
(5)1
| 2 |
| 3 |
| 5 |
| 6 |
| 2 |
| 3 |
| 2 |
| 7 |
| 1 |
| 3 |
=1
| 2 |
| 3 |
| 1 |
| 6 |
| 2 |
| 7 |
| 1 |
| 3 |
=1
| 2 |
| 3 |
| 7 |
| 6 |
| 2 |
| 7 |
| 1 |
| 3 |
=1
| 2 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
=
| 5 |
| 3 |
| 2 |
| 3 |
=
| 5 |
| 2 |
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