题目内容
直接写得数.
1.25×3.6×8=
0.56×4.8+0.56×5.2=
2.82+3.69+0.18=
解:(1)1.25×3.6×8,
=(1.25×8)×3.6,
=10×3.6,
=36;
(2)0.56×4.8+0.56×5.2,
=0.56×(4.8+5.2),
=0.56×10,
=5.6;
(3)2.82+3.69+0.18,
=(2.82+0.18)+3.69,
=3+3.69,
=6.69.
分析:(1)运用乘法交换律简算;
(2)运用乘法分配律简算;
(3)运用加法交换律简算.
点评:运算定律是常用的简便运算的方法,要熟练掌握,灵活运用.
=(1.25×8)×3.6,
=10×3.6,
=36;
(2)0.56×4.8+0.56×5.2,
=0.56×(4.8+5.2),
=0.56×10,
=5.6;
(3)2.82+3.69+0.18,
=(2.82+0.18)+3.69,
=3+3.69,
=6.69.
分析:(1)运用乘法交换律简算;
(2)运用乘法分配律简算;
(3)运用加法交换律简算.
点评:运算定律是常用的简便运算的方法,要熟练掌握,灵活运用.
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