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试题原文 |
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①1.29+3.7+0.71+6.3, =(1.29+0.71)+(3.7+6.3), =2+10, =12; ②528×78+472×78, =(528+472)×78, =1000×78, =78000; ③46.5×99+46.5, =(99+1)×46.5, =100×46.5, =4650; ④125×89×8, =125×8×89, =1000×89, =89000; ⑤12.37-5.32-4.68, =12.37-(5.32+4.68), =12.37-10, =2.37; ⑥12.5×(0.8+8), =12.5×0.8+12.5×8, =10+100, =110. |
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