题目内容
采用灵活、简捷的方法计算
| (1)95.6×19-95.6×9 | (2)(30+
| (3)4-1÷3-
| ||||||
(4)18
| (5)
| (6)3.2×12.5. |
(1)95.6×19-95.6×9,
=95.6×(19-9),
=95.6×10,
=956;
(2)(30+
)÷15,
=(30+
)×
,
=30×
+
×
,
=2+
,
=2
;
(3)4-1÷3-
×8,
=4-
-
,
=4-(
+
),
=4-3,
=1;
(4)18
÷9,
=18
×
,
=(18+
)×
,
=18×
+
×
,
=2+
,
=2
;
(5)
×7.5+(1+
)×3,
=
×7.5+
×3,
=1.5+3.6,
=5.1;
(6)3.2×12.5,
=0.4×8×12.5,
=0.4×(8×12.5),
=0.4×100,
=40.
=95.6×(19-9),
=95.6×10,
=956;
(2)(30+
| 5 |
| 14 |
=(30+
| 5 |
| 14 |
| 1 |
| 15 |
=30×
| 1 |
| 15 |
| 5 |
| 14 |
| 1 |
| 15 |
=2+
| 1 |
| 42 |
=2
| 1 |
| 42 |
(3)4-1÷3-
| 1 |
| 3 |
=4-
| 1 |
| 3 |
| 8 |
| 3 |
=4-(
| 1 |
| 3 |
| 8 |
| 3 |
=4-3,
=1;
(4)18
| 9 |
| 20 |
=18
| 9 |
| 20 |
| 1 |
| 9 |
=(18+
| 9 |
| 20 |
| 1 |
| 9 |
=18×
| 1 |
| 9 |
| 9 |
| 20 |
| 1 |
| 9 |
=2+
| 1 |
| 20 |
=2
| 1 |
| 20 |
(5)
| 1 |
| 5 |
| 1 |
| 5 |
=
| 1 |
| 5 |
| 6 |
| 5 |
=1.5+3.6,
=5.1;
(6)3.2×12.5,
=0.4×8×12.5,
=0.4×(8×12.5),
=0.4×100,
=40.
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