题目内容
心算.
|
(1)3.5 +2.1= |
3.5 -2.1= |
|
(2)0.9 +0.1= |
0.9 -0.1= |
|
(3)0.51 +0.42= |
0.51 -0.42= |
答案:5.6,1.4;1,0.8;0.93,0.09
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心算.
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(1)50 +10= |
(2)60 +30= |
(3)50 +20= |
(4)70 +20= |
心算.
|
(1)50 +10= |
(2)60 +30= |
(3)50 +20= |
(4)70 +20= |