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Urgent primary school fifth grade mixed operation 60! Do not four! The simpler the better!
Four simple mixed operations of fractions
3 / 7 divided by [5 / 7 - (3 / 7 + 1 / 5)]
Another question:
Quarter () quarter () quarter () quarter () quarter () quarter = eighth
Fill in the operation symbol, you can also add brackets
3/7÷[5/7-(3/7+1/5)]=5
（1/4×1/4）÷(1/4+1/4)=1/8
How to calculate unknowns in four mixed operations
Most of them use the method of backward deduction, combined with four mixed operation rules
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