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(1/27-1/36)÷1/9 =(1/27-1/36)×9 =1/3-1/4 =1/12 7÷5×(5/7+5/28) =7/5×(5/7+5/28) =1+1/4 =5/4
(4.36+5.64)+(3.24+4.73)=10+8=18
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