题目内容
简算.
| 27.4+0.8+2.6+9.2 | 101×78 | 4500÷4÷25 |
| 19.53-8.37-1.63 | 15.64+18.2-5.64 | 19×44+19×56. |
(1)27.4+0.8+2.6+9.2
=(27.4+2.6)+(0.8+9.2)
=30+10
=40;
(2)101×78
=(100+1)×78
=100×78+1×78
=7800+78
=7878;
(3)4500÷4÷25
=4500÷(4×25)
=4500÷100
=45;
(4)19.53-8.37-1.63
=19.53-(8.37+1.63)
=19.53-10
=9.53;
(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.
=(27.4+2.6)+(0.8+9.2)
=30+10
=40;
(2)101×78
=(100+1)×78
=100×78+1×78
=7800+78
=7878;
(3)4500÷4÷25
=4500÷(4×25)
=4500÷100
=45;
(4)19.53-8.37-1.63
=19.53-(8.37+1.63)
=19.53-10
=9.53;
(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.
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