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试题原文 |
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解:①24.7-11-9, =24.7-(11+9), =24.7-20, =4; ②1-0.125÷, =1-0.125÷0.125, =1-1, =0; ③84×0.25+×16, =84×0.25+0.25×16, =0.25×(84+16), =0.25×100, =25; ④(2.5+3.6)×2+3.9×2, =2×(2.5+3.6+3.9), =×10, =22.5; ⑤0.875×+0.125÷2, =0.875×+0.125×, =×(0.875+0.125), =×1, = ⑥-30%×0.2÷50%, =0.5-0.3×0.2÷0.5, =0.5-0.12, =0.38 |
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