题目内容
| 用递等式计算,能简算的要简算: 9×
|
| ||||||||||
| (5.6-1.6÷2)×2.5 | (
| ||||||||||
| 1064-780÷0.75+8.25 |
|
(1)9×
+
×9,
=9×(
+
),
=9×1,
=9;
(2)
+(
+
)×8,
=
+
×8+
×8,
=(
+
)+5,
=1+5,
=6;
(3)(5.6-1.6÷2)×2.5,
=(5.6-0.8)×2.5,
=4.8×2.5,
=12;
(4)(
+
+
)÷
,
=
×48+
×48+
×48,
=40+28+18,
=86;
(5)1064-780÷0.75+8.25,
=1064-1040+8.25,
=24+8.25,
=32.25;
(6)
-(
+0.25)÷2.25,
=
-
÷2.25,
=
-
,
=
.
| 5 |
| 18 |
| 13 |
| 18 |
=9×(
| 5 |
| 18 |
| 13 |
| 18 |
=9×1,
=9;
(2)
| 11 |
| 27 |
| 5 |
| 8 |
| 2 |
| 27 |
=
| 11 |
| 27 |
| 5 |
| 8 |
| 2 |
| 27 |
=(
| 11 |
| 27 |
| 16 |
| 27 |
=1+5,
=6;
(3)(5.6-1.6÷2)×2.5,
=(5.6-0.8)×2.5,
=4.8×2.5,
=12;
(4)(
| 5 |
| 6 |
| 7 |
| 12 |
| 3 |
| 8 |
| 1 |
| 48 |
=
| 5 |
| 6 |
| 7 |
| 12 |
| 3 |
| 8 |
=40+28+18,
=86;
(5)1064-780÷0.75+8.25,
=1064-1040+8.25,
=24+8.25,
=32.25;
(6)
| 8 |
| 9 |
| 1 |
| 6 |
=
| 8 |
| 9 |
| 5 |
| 12 |
=
| 8 |
| 9 |
| 5 |
| 27 |
=
| 19 |
| 27 |
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