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一、算一算，填一填
答案
7.9 9.8 0.02 3.9 2.4 9.99
二、连一连
38.6+1.28+1.46
5.7-1.26-3.04
17.8+0.42-4.81
15.4-0.82+1.67
13.41
41.34
16.25
1.4
38.6+1.28+1.46
5.7-1.26-3.04
17.8+0.42-4.81
15.4-0.82+1.67
13.41
41.34
16.25
1.4
答案
38.6+1.28+1.46
=39.88+1.46
=41.34
5.7-1.26-3.04
=4.44-3.04
=1.4
17.8+0.42-4.81
=18.22-4.81
=13.41
15.4-0.82+1.67
=14.58+1.67
=16.25
连线对应：
38.6+1.28+1.46 —— 41.34
5.7-1.26-3.04 —— 1.4
17.8+0.42-4.81 —— 13.41
15.4-0.82+1.67 —— 16.25
=39.88+1.46
=41.34
5.7-1.26-3.04
=4.44-3.04
=1.4
17.8+0.42-4.81
=18.22-4.81
=13.41
15.4-0.82+1.67
=14.58+1.67
=16.25
连线对应：
38.6+1.28+1.46 —— 41.34
5.7-1.26-3.04 —— 1.4
17.8+0.42-4.81 —— 13.41
15.4-0.82+1.67 —— 16.25
三、计算
$5.6+2.7-3.6$
$4.83+2.97+0.03$
$7.89+9.86+1.14$
$15.3-6.24-2.3$
$35.8+2.62+4.38$
$25.86+1.27-5.86$
$5.6+2.7-3.6$
$4.83+2.97+0.03$
$7.89+9.86+1.14$
$15.3-6.24-2.3$
$35.8+2.62+4.38$
$25.86+1.27-5.86$
答案
4.7 7.83 18.89 6.76 42.8 21.27
四、数学医生巧诊断，错的请改正
改正：
（
改正：
（
改正：（
× 34.28
） 改正：（
× 50.63
）答案
× 34.28 × 50.63
