题目内容

【题目】+ 1﹣

++ 2200﹣200÷25×4

24×25 125×25×32

165×65﹣65×65 103×98

(90+125)×8 500﹣(521+504)÷25

24×[(7480﹣6480)÷100]

【答案】,2168;600;100000;6500;1720;10094;459;240

【解析】

试题分析:(1)(3)同分母分数相加,只把分子相加,分母不变;

(2)把1写成,按同分母分数相加减的方法计算;

(4)先算除法和乘法,再算减法;

(5)把24看作6×4,运用乘法结合律简算;

(6)把32看作4×8,运用乘法交换律与结合律简算;

(7)(8)运用乘法分配律简算;

(9)把98看作100﹣2,运用乘法分配律简算;

(10)先算小括号内的,再算中括号内的,最后算括号外的;

(11)先算括号内的,再算括号外的除法,最后算减法.

解:(1)+=

(2)1﹣=

(3)++=

(4)2200﹣200÷25×4,

=2200﹣8×4,

=2200﹣32,

=2168;

(5)24×25,

=6×4×25,

=6×(4×25),

=6×100,

=600;

(6)125×25×32,

=125×25×4×8,

=(125×8)×(25×4),

=1000×100,

=100000;

(7)165×65﹣65×65,

=(165﹣65)×65,

=100×65,

=6500;

(8)(90+125)×8,

=90×8+125×8,

=720+1000,

=1720;

(9)103×98,

=103×(100﹣2),

=103×100﹣103×2,

=10300﹣206,

=10094;

(10)500﹣(521+504)÷25,

=500﹣1025÷25,

=500﹣41,

=459;

(11)24×[(7480﹣6480)÷100]

=24×[1000÷100]

=24×10,

=240.

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