题目内容
简便计算. 4+0.8+2.6+9.2 |
101×78 |
4500÷4÷25. | 53-8.37-1.63 |
15.64+18.2-5.64 | 19×44+19×56. |
分析:(1)运用加法的交换律、结合律进行简算;
(2)把101分解成100+1,再运用乘法分配律简算;
(3)运用除法的性质进行简算;
(4)运用减法的性质进行简算;
(5)先算减法,再算加法;
(6)运用乘法分配律进行简算.
(2)把101分解成100+1,再运用乘法分配律简算;
(3)运用除法的性质进行简算;
(4)运用减法的性质进行简算;
(5)先算减法,再算加法;
(6)运用乘法分配律进行简算.
解答:解:(1)4+0.8+2.6+9.2
=(4+2.6)+(0.8+9.2)
=6.6+10
=16.6;
(2)101×78
=(100+1)×78
=100×78+1×78
=7800+78
=7878;
(3)4500÷4÷25
=4500÷(4×25)
=4500÷100
=45;
(4)53-8.37-1.63
=53-(8.37+1.63)
=53-10
=43;
(5)15.64+18.2-5.64
=15.64-5.64+18.2
=10+18.2
=28.2;
(6)19×44+19×56
=19×(44+56)
=19×100
=1900.
=(4+2.6)+(0.8+9.2)
=6.6+10
=16.6;
(2)101×78
=(100+1)×78
=100×78+1×78
=7800+78
=7878;
(3)4500÷4÷25
=4500÷(4×25)
=4500÷100
=45;
(4)53-8.37-1.63
=53-(8.37+1.63)
=53-10
=43;
(5)15.64+18.2-5.64
=15.64-5.64+18.2
=10+18.2
=28.2;
(6)19×44+19×56
=19×(44+56)
=19×100
=1900.
点评:考查了整数四则混合运算的顺序,灵活运用运算定律进行简算.
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