用你所喜欢的方法算.
|
(1)36 +58= |
(2)37 +38= |
(3)27 +47= |
用凑整的方法算.
|
例:38 +29= |
(1)57 +23= |
|
|
38 +2=40 |
__________ |
|
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40 +27=67 |
__________ |
|
|
(2)75 +17= |
(3)24 +39= |
(4)49 +32= |
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__________ |
__________ |
__________ |
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__________ |
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下面各题应该怎样算?
|
△ =25 |
○ =12 |
□ =96 |
● =48 |
(1)
△+○=( )(2)
●-○=( )(3)
○+●=( )(4)
□-○=( )(5)
□-△=( )(6)
△+●=( )(7)
●-△=( )(8)
△+△=( )列竖式计算.
|
(1)57 +33= |
(2)29 +29= |
(3)27 +27= |
|
(4)48 +48= |
(5)72 +23= |
(6)57 +43= |
列竖式计算.
|
(1)68 +23= |
(2)39 +27= |
(3)68 +28= |
|
(4)39 +49= |
(5)56 +36= |
(6)25 +75= |
用你所喜欢的方法算.
|
(1)45 +37= |
(2)49 +49= |
(3)35 +26= |