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(2012•和平区模拟)运用运算定律或性质进行简算:(1)26.74-(6.74+7.93)(2)15×613+15×913+1113×20%(3)125×2.5×3.2.
题目详情
(2012•和平区模拟)运用运算定律或性质进行简算:
(1)26.74-(6.74+7.93)
(2)
×
+
×
+
×20%
(3)125×2.5×3.2.
(1)26.74-(6.74+7.93)
(2)
1 |
5 |
6 |
13 |
1 |
5 |
9 |
13 |
11 |
13 |
(3)125×2.5×3.2.
▼优质解答
答案和解析
(1)26.74-(6.74+7.93),
=26.74-6.74-7.93,
=20-7.93,
=12.07;
(2)
×
+
×
+
×20%,
=
×(
+
+
),
=
×2,
=
;
(3)125×2.5×3.2.
=(125×8)×(2.5×0.4),
=1000×1,
=1000.
=26.74-6.74-7.93,
=20-7.93,
=12.07;
(2)
1 |
5 |
6 |
13 |
1 |
5 |
9 |
13 |
11 |
13 |
=
1 |
5 |
6 |
13 |
9 |
13 |
11 |
13 |
=
1 |
5 |
=
2 |
5 |
(3)125×2.5×3.2.
=(125×8)×(2.5×0.4),
=1000×1,
=1000.
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