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试题原文 |
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①8.6×10.1, =8.6×(10+0.1), =8.6×10+8.6×0.1, =86+0.86, =86.86; ②78.1-7.7÷0.7×5.2, =78.1-11×5.2, =78.1-57.2, =20.9; ③〔(8.1-5.6)×0.9-1〕×0.4, =[2.5×0.9-1]×0.4, =[2.25-1]×0.4, =1.25×0.4, =0.5; ④8.25×4.08+0.75×4.08+4.08, =(8.25+0.75+1)×4.08, =10×4.08, =40.8; ⑤1.25×32×2.5, =1.25×8×4×2.5, =(1.25×8)×(4×2.5), =10×10, =100; ⑥8.1÷2+1.9÷2, =8.1×0.5+1.9×0.5, =(8.1+1.9)×0.5, =10×0.5, =5. |
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