11分之5减11分之5乘13分之2
=5/11×(1-2/13)
=5/11×11/13
=5/1310.56减（3.78加5.56）10.56减（3.78加5.56）=10.56-5.56-3.78=5-3.78=1.2213分之5乘7分之4乘14请采纳了再提问