题目内容
用你喜欢的方法进行计算.
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| 99%×99+99% | 4×8×1.25×25% |
考点:整数、分数、小数、百分数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)按照先同时算乘法和除法,再算减法顺序计算解答,
(2)(3)(4)(5)运用乘法分配律解答,
(6)运用乘法交换律和结合律解答.
(2)(3)(4)(5)运用乘法分配律解答,
(6)运用乘法交换律和结合律解答.
解答:
解:(1)
×
-
÷
=
-
=
;
(2)
×
+
÷
=
×(
+
)
=
×1
=1
;
(3)
×
+
÷6
=(
+
)×
=1×
=
;
(4)
×
+
×
=
×(
+
)
=
×1
=
;
(5)99%×99+99%
=99%×(99+1)
=99%×100
=99;
(6)4×8×1.25×25%
=(4×25%)×(8×1.25)
=1×10
=10.
| 8 |
| 15 |
| 3 |
| 4 |
| 1 |
| 6 |
| 1 |
| 2 |
=
| 2 |
| 5 |
| 1 |
| 3 |
=
| 1 |
| 15 |
(2)
| 5 |
| 4 |
| 5 |
| 6 |
| 1 |
| 6 |
| 4 |
| 5 |
=
| 5 |
| 4 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 5 |
| 4 |
=1
| 1 |
| 4 |
(3)
| 5 |
| 7 |
| 1 |
| 6 |
| 2 |
| 7 |
=(
| 5 |
| 7 |
| 2 |
| 7 |
| 1 |
| 6 |
=1×
| 1 |
| 6 |
=
| 1 |
| 6 |
(4)
| 1 |
| 8 |
| 3 |
| 4 |
| 1 |
| 8 |
| 1 |
| 4 |
=
| 1 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 8 |
=
| 1 |
| 8 |
(5)99%×99+99%
=99%×(99+1)
=99%×100
=99;
(6)4×8×1.25×25%
=(4×25%)×(8×1.25)
=1×10
=10.
点评:正确选择并运用简便方法解决问题,是本题考查知识点.
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