题目内容

【题目】9.2×12= 37÷9=

×21= 5.089×=

59×= 12÷=

×÷×= +()÷1=

34×3.1+5.1×14﹣6= ++++=

3++++++= 4.25×1.32×0.75÷(1×1)=

【答案】115;;20;0.05089;27;137;;0;40.8;;1.7.

【解析】

试题分析:(1)先把分数化成小数,再计算;

(2)(6)根据除以一个数等于乘这个数的倒数计算;

(3)先把化成1﹣,再运用乘法分配律简算;

(4)把5.089的小数点向左移动两位即可;

(5)把59分解成58+1,再运用乘法分配律简算;

(7)先把除法变成乘法,再运用乘法结合律简算;

(8)先把除法变成乘法,运用乘法分配律简算,再运用加法交换律和减法的性质简算;

(9)先算乘法,再算加减法;

(10)==…由此化简求解;

(11)先提取因数3,然后再把剩下的分数分解;如==…;

(12)先根据除法的性质,去掉小括号,再运用乘法结合律简算.

解:(1)9.2×12=115;

(2)37÷9,

=×

=

(3)×21,

=(1﹣)×21,

=1×21﹣×21,

=21﹣

=20

(4)5.089×=0.05089;

(5)59×

=(58+1)×

=58×+1×

=27+

=27

(6)12÷

=×11,

=137;

(7)×÷×

=(×)×(×),

=1×

=

(8)+()÷1

=+()×

=+××

=+

=(+)﹣(+),

=1﹣1,

=0;

(9)34×3.1+5.1×14﹣6

=105.4﹣71.4﹣6.8,

=34﹣6.8,

=40.8;

(10)++++

=++

=

=

(11)3++++++

=3×(1++++++),

=3×[1+(1﹣)+()+()+()+()+(]

=3×(+1﹣+++++),

=3×(1+1),

=3×1

=

(12)4.25×1.32×0.75÷(1×1),

=4.25×1.32×0.75÷1.32÷1.1875,

=(4.25×0.75÷1.1875)×(1.32×1.32),

=1.7×1,

=1.7.

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