题目内容
0.25×4.8×0.48 | + | 0.25×8 | ++. |
解:(1)0.25×4.8×0.48,
=0.25×(4+0.8)×0.48,
=(0.25×4+0.25×0.8)×0.48,
=(1+0.2)×0.48,
=1×0.48+0.2×0.48,
=0.48+0.096,
=0.576;
(2)+,
=+,
=;
(3)0.25×8=2;
(4)++,
=++,
=1+,
=1.
分析:(1)将4.8分成4和0.8,利用乘法分配律解答即可;
(2)先通分化成同分母分数,再相加即可;
(3)直接利用乘法计算的方法,解答即可;
(4)先计算+,所得的和再与相加即可.
点评:此题主要考查分数、小数四则混合运算的方法,要注意,能简便计算的,要简便计算.
=0.25×(4+0.8)×0.48,
=(0.25×4+0.25×0.8)×0.48,
=(1+0.2)×0.48,
=1×0.48+0.2×0.48,
=0.48+0.096,
=0.576;
(2)+,
=+,
=;
(3)0.25×8=2;
(4)++,
=++,
=1+,
=1.
分析:(1)将4.8分成4和0.8,利用乘法分配律解答即可;
(2)先通分化成同分母分数,再相加即可;
(3)直接利用乘法计算的方法,解答即可;
(4)先计算+,所得的和再与相加即可.
点评:此题主要考查分数、小数四则混合运算的方法,要注意,能简便计算的,要简便计算.
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