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8÷(-2)²-(-9/5)÷(3/5)²=?

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/14 19:17:23
8÷(-2)²-(-9/5)÷(3/5)²=?
8÷(-2)²-(-9/5)÷(3/5)²=2/3 + 3/5 ÷ (-2/5) - 3/4 × (-4/5)=?
8÷(-2)²-(-9/5)÷(3/5)²= 2/3 + 3/5 ÷ (-2/5) - 3/4 × (-4/5)=?不小心连一块了。
8÷(-2)²-(-9/5)÷(3/5)²
=8÷4+9/5×25/9
=2+5
=7
2/3 + 3/5 ÷ (-2/5) - 3/4 × (-4/5)
=2/3-3/5×5/2+3/4×4/5
=2/3 -3/2 +3/5
=(20-45+18)/30
=-7/30