For rational numbers a and b, define the operation a△b=3a+b/a-3b, and calculate (-2)△[7△(-6)] How did you get this formula! Okay,100. For rational numbers a and b, define the operation a△b=3a+b/a-3b, and calculate (-2)△[7△(-6)] How did you get this formula! Okay,100 points.

(-2)△(21-6) -6+15=9

For rational numbers a, b, define the operation a & b=(3a+b)/(a-3b) and calculate 7&(-6) Note: It refers to the triangle symbol. I can't type it.

When a & b =(3a+b)÷(a-3b)
7&(-6)
=(3×7-6)÷[7-3×(-6)]
=15÷25
=3/5

When a & b=(3a+b)÷(a-3b)
7&(-6)
=(3×7-6)÷[7-3×(-6)]
=15÷25
=3/5

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