\(1,\\ a,a+b=23+36=59;b+a=36+23=59\\ b,a+b=b+a\left(=59\right)\\ 2,\\ a,a+b=37+18=55;b+a=18+37=55\\ b,a+b=b+a\left(=55\right)\\ 3,\\ a,\left(a+b\right)+c=\left(17+19\right)+26=36+26=62;a+\left(b+c\right)=17+\left(19+26\right)=17+45=62\\ b,\left(a+b\right)+c=a+\left(b+c\right)\left(=62\right)\\ 4,\\ a,\left(a+b\right)+c=\left(11+23\right)+35=34+35=69;a+\left(b+c\right)=11+\left(23+35\right)=11+58=69\\ b,\left(a+b\right)+c=a+\left(b+c\right)\left(=69\right)\)
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