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加法运算律练习
加法运算律 · 1–12
用加法运算律填空。
3.(17 + 8) + 2 = 17 + ( + 2)
5.(11 + 7) + 7 = 11 + ( + 7)
7.(12 + 6) + 4 = 12 + ( + 4)
8.(17 + 7) + 4 = 17 + ( + 4)
9.(10 + 3) + 2 = 10 + ( + 2)
10.(13 + 1) + 6 = 13 + ( + 6)
11.(9 + 2) + 2 = 9 + ( + 2)
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