题目内容
【题目】用你喜欢的方法计算.
136× 2001×3.14+200.1×31.4+20.01×314
﹣[(+)×] 333×334+999×222
1.25×17.6+36.1÷0.8+2.63×12.5 ÷(+2.5×)
【答案】(1)136×
=(135+1)×,
=135×+1×,
=2+,
=2;
(2)2001×3.14+200.1×31.4+20.01×314
=2001×3.14+2001×3.14+2001×3.14,
=2001×3.14×3,
=(2000+1)×9.42,
=2000×9.42+1×9.42,
=18840+9.42,
=18849.42;
(3)﹣[(+)×]
=﹣[×],
=﹣,
=;
(4)333×334+999×222
=333×334+333×(3×222),
=333×334+333×666,
=333×(334+666),
=333×1000,
=333000.
(5)1.25×17.6+36.1÷0.8+2.63×12.5
=1.25×17.6+36.1×1.25+26.3×1.25,
=(17.6+36.1+26.3)×1.25,
=80×1.25,
=100;
(6)÷(+2.5×)
=1÷(+2),
=÷,
=.
【解析】
试题分析:(1)可将136拆分为135+1后,根据乘法分配律计算;
(2)可根据乘法算式的性质将题目中的乘法变为具有相同因数2001与3.14的算式后,再将2001拆分为2000+1进行计算;
(3)(6)根据四则混合运算的运算顺序计算即可,先算乘除,再算加减,有括号的要先算括号里面的;
(4)可将999拆分为333×3后再根据乘法结合律、分配律计算;
(5)可将36.1÷0.8变为36.1×1.25后,将2.63×12.5变化26.3×1.25后再根据乘法分配律计算.