如题所述
20.41-(51-31.86)
=20.41-51+31.86
=20.41+31.86-51
=52.27-51
=1.27
=20.41-51+31.86
=20.41+31.86-51
=52.27-51
=1.27
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第1个回答 2020-12-20
20.41-(51-31.86)
=20.41-51+31.86
=20+0.41-51+31+0.86
=(20+31-51)+(0.41+0.86)
=0+1.27
=1.27。
=20.41-51+31.86
=20+0.41-51+31+0.86
=(20+31-51)+(0.41+0.86)
=0+1.27
=1.27。
第2个回答 2020-12-20
20.41-(51-31.86)
=20.41-51+31.86 (去括号，变号)
=20.41+31.86-51 （移项）
=52.27-51
=1.27
=20.41-51+31.86 (去括号，变号)
=20.41+31.86-51 （移项）
=52.27-51
=1.27
第3个回答 2020-12-20
=20.41+31.86-51
=52.27-51
=1.27
=52.27-51
=1.27
