(1 17/18×1 114-2 5/8÷1 19/20)÷(2 25/78-1 1/26)=1 91/104
1)1 17/18×1 13/14=35/18×27/14=5×3/2×2=15/4
2)2 5/8÷1 19/20=21/8÷39/20=21×20/8×39=7×5/2×13=35/26
3) 5/4-35/26=195-70/52=125/52
4)2 25/78-1 1/26=181/78-27/26=181-81/78=100/78=50/39
5)125/52÷50/39=125/52×39/50=25×39/52×10=975/520= 1 ЦЕЛАЯ 455/5201
91/104
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