题目内容

递等式计算
3300-200÷25×4         

40×77×25              

125×(39×8)
24×49+51×24          136×98-36×98             (90+125)×8
3508-465-1635         6000÷125÷8          918-[57-(39-27)]×4
考点:整数四则混合运算
专题:运算顺序及法则
分析:(1)先算除法,再算乘法,最后算减法;
(2)利用乘法交换律简算;
(3)利用乘法交换律和结合律简算;
(4)(5)(6)运用乘法分配律简算;
(7)根据减法的性质简算;
(8)根据除法的性质简算;
(9)先算小括号里面的减法,再算中括号里面的减法,然后算括号外的乘法,最后算括号外的减法.
解答: 解:(1)3300-200÷25×4 
=3300-8×4
=3300-32
=3268;

(2)40×77×25  
=40×25×77
=1000×77
=77000;

(3)125×(39×8)
=125×8×39
=1000×39
=39000;

(4)24×49+51×24
=24×(49+51)
=24×100
=2400;

(5)136×98-36×98 
=(136-36)×98
=100×98
=9800;

(6)(90+125)×8
=90×8+125×8
=720+1000
=1720;

(7)3508-465-1635 
=3508-(465+1635)
=3508-2100
=1408;

(8)6000÷125÷8
=6000÷(125×8)
=6000÷1000
=6;

(9)918-[57-(39-27)]×4
=918-[57-12]×4
=918-45×4
=918-180
=738.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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