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试题原文 |
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(1)19.8×0.54÷0.081, =10.692÷0.081, =132; (2)0.25×32×1.25, =0.25×(4×8)×1.25, =(0.25×4)×(1.25×8), =1×10, =10; (3)1.89÷0.54-7.1÷2.5, =3.5-2.84, =0.66; (4)0.25×26×40, =0.25×40×26, =10×26, =260; (5)8.7×99, =8.7×(100-1), =8.7×100-8.7×1, =870-8.7, =861.3; (6)3.14×7.9+31.4×0.21, =3.14×7.9+3.14×2.1, =3.14×(7.9+2.1), =3.14×10, =31.4. |
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