题目内容
计算下面各题.
0.8×6.3-0.8×3.3 | 21.36÷0.8-12.9 | 7.28+3.2÷2.5. |
解:(1)0.8×6.3-0.8×3.3,
=0.8×(6.3-3.3),
=0.8×3,
=2.4;
(2)21.36÷0.8-12.9,
=26.7-12.9,
=13.8;
(3)7.28+3.2÷2.5,
=7.28+1.28,
=8.56.
分析:(1)运用乘法分配律简算;
(2)先算除法,再算减法;
(3)先算除法,再算加法.
点评:此题考查了小数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
=0.8×(6.3-3.3),
=0.8×3,
=2.4;
(2)21.36÷0.8-12.9,
=26.7-12.9,
=13.8;
(3)7.28+3.2÷2.5,
=7.28+1.28,
=8.56.
分析:(1)运用乘法分配律简算;
(2)先算除法,再算减法;
(3)先算除法,再算加法.
点评:此题考查了小数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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