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4.375+450÷18×25=375+25×25=375+625=1000 (五分之四+四分之一)÷三分之七+十分之七=二十分之二十一÷三分之七+十分之七=二十分之九+十分之七=二十分之十三 5.20×28÷16=560÷16=35(天)35-28=7(天)答:实际比计划多用7天。 6.196×3/7×4/3=84×4/3=63(万人)答:第三季度接待游客63万人。 7.160×(1-20%)=160×80%=128(元)答:现在每套服装的成本是128元 注:纯原创,望采纳。祝:学习进步,事事顺心,合家欢心,天天开心。