题目内容
简算.
16.78-3.2-6.8;
43×0.75-3×0.75;
16.5-3.9+3.5-6.1;
125×3.2×6.
16.78-3.2-6.8;
43×0.75-3×0.75;
16.5-3.9+3.5-6.1;
125×3.2×6.
考点:小数四则混合运算,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)运用减法的性质简算;
(2)运用乘法分配律简算;
(3)运用减法的性质和加法的结合律简算;
(4)把3.2写为8×0.4,再利用乘法的结合律简算.
(2)运用乘法分配律简算;
(3)运用减法的性质和加法的结合律简算;
(4)把3.2写为8×0.4,再利用乘法的结合律简算.
解答:
解:(1)16.78-3.2-6.8
=16.78-(3.2+6.8)
=16.78-10
=6.78;
(2)43×0.75-3×0.75;
=0.75×(43-3)
=0.75×40
=30;
(3)16.5-3.9+3.5-6.1;
=16.5+3.5-(3.9+6.1)
=20-10
=10;
(4)125×3.2×6
=125×8×0.4×6
=1000×2.4
=2400.
=16.78-(3.2+6.8)
=16.78-10
=6.78;
(2)43×0.75-3×0.75;
=0.75×(43-3)
=0.75×40
=30;
(3)16.5-3.9+3.5-6.1;
=16.5+3.5-(3.9+6.1)
=20-10
=10;
(4)125×3.2×6
=125×8×0.4×6
=1000×2.4
=2400.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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