87.98-45.32=21.对不起应该是87.98-45.32=21.

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87.98-45.32=21.对不起应该是87.98-45.32=21.
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87.98-45.32=21.对不起应该是87.98-45.32=21.
87.98-45.32=21.
对不起
应该是87.98-45.32=21.

87.98-45.32=21.对不起应该是87.98-45.32=21.
87.98-45.32
=﹙88-0.02﹚-45-0.32
=88-45-﹙0.02+0.32﹚
=43-0.34
=42.66
42.66≠21.65
∵ 经过计算检验87.98-45.32=21.65不成立
∴ 原题目错误.
题目改了,重解.
87.98-45.32+21.65
=﹙88-0.02﹚+21+0.65-45-0.32
=(88+21-45)+﹙0.65-0.02-0.32﹚
=64+0.31
=64.31

不相等啊