判斷下面的計(jì)算是(√)否(×)正確。
(     ) 1. three + four -five = two
(     ) 2. five + four -three = four
(     ) 3. six + two -four = five
(     ) 4. nine + five -two = seven
(     ) 5. seven + one -four = four
1. √  2. ×  3. ×  4. ×  5. √
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