Номер573 помагите !!!!!!

Question

Номер573 помагите !!!!!!

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Answer 1

(3/5*7/8+12/25)*33 1/3=(21/40+12/25)*33 1/3 =(5*21/200+8*12/200)*33 1/3=(105/200+96/200)*33 1/3=201/200*100/3=201/2*1/3=67/2*1/1=67/2=33 1/2  

(10 1/2+9 1/4)*(10 1/2-9 1\4)=
10 1/2+9 1/4=21/2+37/4=42/4+37/4=79/4
10 1/2-9 !\4=21/2-37/4=42/4-37/4=5/4
79/4*5/4=395/16=24 11/16

Answer 2

(3/5+7/8+12/25)*33 1/3=(120/200+175/200+96/200)*100/3=
=391/200*100/3=391/6=65 1/6
(10 1/2+9 1/4)*(10 1/2-9 1/4)=(10 3/4+9 1/4)*(10 3/4-9 1/4)=20*1 1/2=30