2.89-(1.23+0.89)的简便运算,
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![2.89-(1.23+0.89)的简便运算,](/uploads/image/z/5326303-31-3.jpg?t=2.89-%281.23%2B0.89%29%E7%9A%84%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%2C)
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2.89-(1.23+0.89)的简便运算,
2.89-(1.23+0.89)的简便运算,
2.89-(1.23+0.89)的简便运算,
2.89-(1.23+0.89)
=2.89-1.23-0.89
=2.89-0.89-1.23
=2-1.23
=0.77
2.89-0.89-1.23=2-1.23=0.77