情把解写规范完整、谢谢一,4(20-x)=24 二,0.3(0.4-x)=0.12 三.(7+x)/4=15
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![情把解写规范完整、谢谢一,4(20-x)=24 二,0.3(0.4-x)=0.12 三.(7+x)/4=15](/uploads/image/z/1012770-18-0.jpg?t=%E6%83%85%E6%8A%8A%E8%A7%A3%E5%86%99%E8%A7%84%E8%8C%83%E5%AE%8C%E6%95%B4%E3%80%81%E8%B0%A2%E8%B0%A2%E4%B8%80%2C4%EF%BC%8820-x%29%3D24+%E4%BA%8C%2C0.3%280.4-x%EF%BC%89%3D0.12+%E4%B8%89.%287%2Bx%29%2F4%3D15)
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