题目内容
简便计算看我的.
3.95×7.6+3.95×3.4-3.95
2.44×1.25×8
3.25+0.4+0.6+1.75
56.8-2.74-5.26.
3.95×7.6+3.95×3.4-3.95
2.44×1.25×8
3.25+0.4+0.6+1.75
56.8-2.74-5.26.
分析:(1)运用乘法的分配律进行简算;
(2)运用乘法的结合律进行简算;
(3)运用加法交换律及结合律计算;
(4)运用减法的性质进行简算.
(2)运用乘法的结合律进行简算;
(3)运用加法交换律及结合律计算;
(4)运用减法的性质进行简算.
解答:解:(1)3.95×7.6+3.95×3.4-3.95
=3.95×(7.6+3.4-1)
=3.95×10
=39.5
(2)2.44×1.25×8
=2.44×(1.25×8)
=2.44×10
=24.4
(3)3.25+0.4+0.6+1.75
=3.25+1.75+0.4+0.6
=(3.25+1.75)+(0.4+0.6)
=5+1
=6
(4)56.8-2.74-5.26
=56.8-(2.74+5.26)
=56.8-8
=48.8
=3.95×(7.6+3.4-1)
=3.95×10
=39.5
(2)2.44×1.25×8
=2.44×(1.25×8)
=2.44×10
=24.4
(3)3.25+0.4+0.6+1.75
=3.25+1.75+0.4+0.6
=(3.25+1.75)+(0.4+0.6)
=5+1
=6
(4)56.8-2.74-5.26
=56.8-(2.74+5.26)
=56.8-8
=48.8
点评:考查了运算定律与简便运算,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定律简便计算.
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