如果规定符号“※”的意义是a※b=ab/a+b,求2※(-3)※4的值.
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![如果规定符号“※”的意义是a※b=ab/a+b,求2※(-3)※4的值.](/uploads/image/z/2009042-26-2.jpg?t=%E5%A6%82%E6%9E%9C%E8%A7%84%E5%AE%9A%E7%AC%A6%E5%8F%B7%E2%80%9C%E2%80%BB%E2%80%9D%E7%9A%84%E6%84%8F%E4%B9%89%E6%98%AFa%E2%80%BBb%3Dab%2Fa%2Bb%2C%E6%B1%822%E2%80%BB%EF%BC%88-3%EF%BC%89%E2%80%BB4%E7%9A%84%E5%80%BC.)
如果规定符号“※”的意义是a※b=ab/a+b,求2※(-3)※4的值.
如果规定符号“※”的意义是a※b=ab/a+b,求2※(-3)※4的值.
如果规定符号“※”的意义是a※b=ab/a+b,求2※(-3)※4的值.
2※(-3)
=[2×(-3)]/[2+(-3)]
=(-6)/(-1)
=6
所以原式=6※4
=(6×4)/(6+4)
=2.4
2※(-3)※4
=2*(-3)/(2-3)※4
=6※4
=6*4/(6+4)
=2.4
2※(-3)=2×(-3)÷(2+(-3))=6
所以
2※(-3)※4
=6※4
=6×4÷(6+4)
=2.4
2※(-3)=2*(-3)/2+(-3)=6
2※(-3)※4=6*4/6+4=2.4