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下面各题,怎样简便就怎样计算.(递等式)
①18.9-18.9÷1.4+1.1 ②0.25×(4.8-7.5÷3)
③2.3×1.5+4.5÷0.75 ④144÷0.6-4.2×3
⑤18.5-(5.6+4.8)÷1.3 ⑥2.2×0.25+2.8×0.25
⑦1.4×[(7.5+38.4)÷0.9] ⑧(2.5-2.5×0.6)÷0.4
⑨[(8.1-5.6)×0.9]×0.4
人气:395 ℃ 时间:2020-05-08 16:31:46
解答
①=18.9×(1-1÷1.4)+1.1=5.4+1.1=6.5 ②=0.25×4.8-7.5×0.25÷3=1.2-0.625=0.575③=2.3×1.5+1.5×3÷0.75=1.5×(2.3+3÷0.75)=9.45 ④=12×12÷0.6-4.2×3=12×20-4.2×3=227.4⑤=18.5-10.4÷1.3=18.5-8=10.5 ⑥=...
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