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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。
2.(5 + 3) + 6 = 5 + ( + 6)
6.(13 + 2) + 9 = 13 + ( + 9)
7.(10 + 4) + 9 = 10 + ( + 9)
9.(18 + 6) + 2 = 18 + ( + 2)
10.(10 + 8) + 8 = 10 + ( + 8)
11.(15 + 2) + 6 = 15 + ( + 6)
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