丨12a-2丨+(14b-1)²=0则必有:12a-2=014b-1=0解得:a=1/6或b=1/14 5a-{7b-[11a-6b-5(2a+五分之b)]}=5a-7b-11a+6b+10a+b=4a=4×1/6=2/3即3分之2
a=1/6,b=1/14。5a-{7b-[11a-6b-5(2a+b/5)]}=5a-{7b-[11a-6b-10a-b]}=5a-7b+a-7b=6a-14b=6*1/6-14*1/14=0