题目内容
120×5= | 480÷20= | 30×7×2= | 419+98= |
25×36= | 360-90= | 210÷15÷2= | 630÷18= |
492-145-155 | 76+48÷6 | 740+910÷13 | 360÷(136-64) |
720÷36×35 | 150+(140×8-252) |
分析:(1)(3)依据整数乘法计算方法解答;
(2)依据整数除法计算方法解答;
(4)依据加法的性质解答;
(5)化36=4×9,再运用乘法结合律解答;
(6)依据整数减法计算方法解答;
(7)运用除法性质解答;
(8)化18=9×2,再运用除法性质解答;
(9)依据减法性质解答;
(10)(11)按照先算第二级运算,再算第一级运算的顺序解答;
(12)(14)按照先算括号里面的,在算括号外面的顺序解答;
(13)按照从左到右顺序顺序解答.
(2)依据整数除法计算方法解答;
(4)依据加法的性质解答;
(5)化36=4×9,再运用乘法结合律解答;
(6)依据整数减法计算方法解答;
(7)运用除法性质解答;
(8)化18=9×2,再运用除法性质解答;
(9)依据减法性质解答;
(10)(11)按照先算第二级运算,再算第一级运算的顺序解答;
(12)(14)按照先算括号里面的,在算括号外面的顺序解答;
(13)按照从左到右顺序顺序解答.
解答:解:(1)120×5=600;
(2)480÷20=24;
(3)30×7×2
=210×2
=420;
(4)419+98
=419+100-2
=519-2
=517;
(5)25×36
=25×4×9
=100×9
=900;
(6)360-90=270;
(7)210÷15÷2
=210÷(15×2)
=210÷30
=7;
(8)630÷18
=630÷9÷2
=70÷2
=35;
(9)492-145-155
=492-(145+155)
=492-300
=192;
(10)76+48÷6
=76+8
=84;
(11)740+910÷13
=740+70
=810;
(12)360÷(136-64)
=360÷72
=5;
(13)720÷36×35
=20×35
=700;
(14)150+(140×8-252)
=150+(720-252)
=150+468
=618.
(2)480÷20=24;
(3)30×7×2
=210×2
=420;
(4)419+98
=419+100-2
=519-2
=517;
(5)25×36
=25×4×9
=100×9
=900;
(6)360-90=270;
(7)210÷15÷2
=210÷(15×2)
=210÷30
=7;
(8)630÷18
=630÷9÷2
=70÷2
=35;
(9)492-145-155
=492-(145+155)
=492-300
=192;
(10)76+48÷6
=76+8
=84;
(11)740+910÷13
=740+70
=810;
(12)360÷(136-64)
=360÷72
=5;
(13)720÷36×35
=20×35
=700;
(14)150+(140×8-252)
=150+(720-252)
=150+468
=618.
点评:本题考查知识点:(1)依据四则运算计算方法正确进行计算,(2)运用简便方法解决问题.
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