计算:(1)(-3)×(-5)-45÷(-15) (2)3×(-4)+(-28)÷7 (3)(-2.5)×(-4.8)÷
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/07/02 14:14:57
计算:(1)(-3)×(-5)-45÷(-15) (2)3×(-4)+(-28)÷7 (3)(-2.5)×(-4.8)÷(-1.6)
(4)-3/4×[-3的平方×(-2/3)的平方-(-2)的3次方]
(4)-3/4×[-3的平方×(-2/3)的平方-(-2)的3次方]
![计算:(1)(-3)×(-5)-45÷(-15) (2)3×(-4)+(-28)÷7 (3)(-2.5)×(-4.8)÷](/uploads/image/z/203588-44-8.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%881%EF%BC%89%EF%BC%88-3%EF%BC%89%C3%97%EF%BC%88-5%EF%BC%89-45%C3%B7%EF%BC%88-15%EF%BC%89+%EF%BC%882%EF%BC%893%C3%97%EF%BC%88-4%EF%BC%89%2B%EF%BC%88-28%EF%BC%89%C3%B77+%EF%BC%883%EF%BC%89%EF%BC%88-2.5%EF%BC%89%C3%97%EF%BC%88-4.8%EF%BC%89%C3%B7)
(1)(-3)×(-5)-45÷(-15)
=15+3
=18
(2)3×(-4)+(-28)÷7
=-12-4
=-16
(3)(-2.5)×(-4.8)÷(-1.6)
=12÷(-1.6)
=-7.5
(4)-3/4×[-3的平方×(-2/3)的平方-(-2)的3次方]
=-3/4×[-9×(-4/9)+8]
=-3/4×[4+8]
=-3/4×12
=-9
=15+3
=18
(2)3×(-4)+(-28)÷7
=-12-4
=-16
(3)(-2.5)×(-4.8)÷(-1.6)
=12÷(-1.6)
=-7.5
(4)-3/4×[-3的平方×(-2/3)的平方-(-2)的3次方]
=-3/4×[-9×(-4/9)+8]
=-3/4×[4+8]
=-3/4×12
=-9
计算:(-15)÷(13
计算:(1)(-3)×(-5)-45÷(-15) (2)3×(-4)+(-28)÷7 (3)(-2.5)×(-4.8)÷
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