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试题原文 |
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(1)3.7+6.3×0.5, =3.7+3.15, =6.85; (2)21.6÷3×(20-19.8), =7.2×0.2, =1.44; (3)2.5×2.9×4×2, =(2.5×4)×(2.9×2), =10×5.8, =58; (4)16.53-3.57-6.43, =16.53-(3.57+6.43), =16.53-10, =6.53; (5)5.28×9.8+0.2×5.28, =(9.8+0.2)×5.28, =10×5.28, =52.8; (6)28-2×9.5+2.8, =28-19+2.8, =9+2.8, =11.8; (7)(10-9.2)×(2.6-2.1)÷5, =0.8×0.5÷5, =0.4÷5, =0.08; (8)1.5×[(3.6-0.36÷0.6)-5], =1.5×[(3.6-0.6)-5], =1.5×[3-5], =1.5×(-2), =-3. |
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