脱式小数加减混合计算三位数
这类题需认真解答,以例说明。
2.563-0.231-0.621+1.437
=2.563+1.437-(0.231+0.621)
=2.563+1.437-0.852
=4-0.852
=3.148
2.563-0.231-0.621+1.437
=2.563+1.437-(0.231+0.621)
=2.563+1.437-0.852
=4-0.852
=3.148
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