20-4.57+6.85简便运算怎么算?
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20-4.57+6.85简便运算怎么算?20-4.57+6.85简便运算怎么算?20-4.57+6.85简便运算怎么算?20-4.57+6.85=20-4+6+0.85-0.57=22+0.28=22
20-4.57+6.85简便运算怎么算?
20-4.57+6.85简便运算怎么算?
20-4.57+6.85简便运算怎么算?
20-4.57+6.85
=20-4+6+0.85-0.57
=22+0.28
=22.28
20-4.57+6.85
=20+6.85-4.57
=20+6.85-(4.6-0.03)
=20+6.85-4.6+0.03
=20+2.25+0.03
=20+2.28
=22.28
=20-4.57+(4.57+2.28)
=20+2.28
=22.28