1.已知|a|=3,|b|=5 ,且a〈b,求a-b的值.2.已知|a|=3,|b|=5,a与b异号,求|a-b|的值.3.(1)|-3|+|-2|=?(2)|-7|-|+2|=?(3) |-三分之二| × |-五分之三|=?(4)0÷|-三又四分之一|=?
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![1.已知|a|=3,|b|=5 ,且a〈b,求a-b的值.2.已知|a|=3,|b|=5,a与b异号,求|a-b|的值.3.(1)|-3|+|-2|=?(2)|-7|-|+2|=?(3) |-三分之二| × |-五分之三|=?(4)0÷|-三又四分之一|=?](/uploads/image/z/620340-60-0.jpg?t=1.%E5%B7%B2%E7%9F%A5%7Ca%7C%3D3%2C%7Cb%7C%3D5+%2C%E4%B8%94a%E3%80%88b%2C%E6%B1%82a-b%E7%9A%84%E5%80%BC.2.%E5%B7%B2%E7%9F%A5%7Ca%7C%3D3%2C%7Cb%7C%3D5%2Ca%E4%B8%8Eb%E5%BC%82%E5%8F%B7%2C%E6%B1%82%7Ca-b%7C%E7%9A%84%E5%80%BC.3.%EF%BC%881%EF%BC%89%7C-3%7C%2B%7C-2%7C%3D%3F%EF%BC%882%EF%BC%89%7C-7%7C-%7C%2B2%7C%3D%3F%283%29+%7C-%E4%B8%89%E5%88%86%E4%B9%8B%E4%BA%8C%7C+%C3%97+%7C-%E4%BA%94%E5%88%86%E4%B9%8B%E4%B8%89%7C%3D%3F%EF%BC%884%EF%BC%890%C3%B7%7C-%E4%B8%89%E5%8F%88%E5%9B%9B%E5%88%86%E4%B9%8B%E4%B8%80%7C%3D%3F)
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