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试题原文 |
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(1)8.16+5.49+2.84+4.51, =(8.16+2.84)+(5.49+4.51), =11+10, =21; (2)1.29+3.7+2.71+6.3, =(1.29+2.71)+(3.7+6.3), =4+10, =14; (3)12.98-(6.37+3.98), =12.98-3.98-6.37, =9-6.37, =2.63; (4)36.9-10.47+3.1-10.53, =(36.9+3.1)-(10.47+10.53), =40-21, =19; |
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