题目内容

计算下面各题(能简算的要简算)
(1)6.3×60%+4.7×60%-0.6=
(2)0.25×13×4×数学公式=
(3)(13.62-8.4×1.05)÷0.32=
(4)11×11×11-11×11-10=
(5)1.5×[0.02÷(2.1-2.09)]=

解:(1)6.3×60%+4.7×60%-0.6,
=60%×(6.3+4.7-1),
=60%×10,
=6;

(2)0.25×13×4×
=(0.25×4)×(13×),
=1×1,
=1;

(3))(13.62-8.4×1.05)÷0.32,
=(13.62-8.82)÷0.32,
=4.8÷0.32,
=15;

(4)11×11×11-11×11-10,
=11×11×(11-1)-10,
=121×10-10,
=10×(121-1),
=10×120,
=1200;

(5)1.5×[0.02÷(2.1-2.09)],
=1.5×[0.02÷0.01],
=1.5×2,
=3.
分析:(1)化0.6=60%,运用乘法分配律解答,
(2)运用乘法交换律和乘法结合律解答,
(3)先算括号里的8.4×1.05=8.82,再算括号里13.62-8.82=4.8,最后算4.8÷0.32解答,
(4)运用乘法分配律解答,
(5)先算小括号里2.1-2.09=0.01,再算中括号里0.02÷0.01=2,最后算1.5×2解答.
点评:本题主要考查学生对于四则运算计算方法以及简便运算定律掌握.
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