题目内容
怎样简便怎样算.
| ( | ||
| 100× |
解:
(1)
×
×6,
=
×6×
,
=5×
,
=
;
(2)
×
×
,
=
×(
×
),
=
×
,
=
;
(3)(
+
)×14,
=
×14+
×14,
=6+7,
=13;
(4)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(5)100×
,
=(99+1)×
,
=99×
+1×
,
=2+
,
=2
;
(6)
×
×
×
,
=(
×
)×(
×
),
=
×
,
=
.
分析:(1)根据乘法交换律进行计算;
(2)根据乘法结合律进行计算;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算;
(5)根据乘法分配律进行计算;
(6)根据乘法结合律进行计算.
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
(1)
=
=5×
=
(2)
=
=
=
(3)(
=
=6+7,
=13;
(4)
=
=
=
(5)100×
=(99+1)×
=99×
=2+
=2
(6)
=(
=
=
分析:(1)根据乘法交换律进行计算;
(2)根据乘法结合律进行计算;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算;
(5)根据乘法分配律进行计算;
(6)根据乘法结合律进行计算.
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
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