1) ( Х+15) +(у-8) =(Х+у) +(15-8) =
=(Х+у) +7=35+7=42;
2) (Х:5) *(у:2) =(Х*у) :(5*2 ) =60:10=6;
3) Х:(у*3) =(Х:у) *3=12:3=4;
4) (Х*2) :у=(Х:у) *2=10*2=20.
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Answers & Comments
1) ( Х+15) +(у-8) =(Х+у) +(15-8) =
=(Х+у) +7=35+7=42;
2) (Х:5) *(у:2) =(Х*у) :(5*2 ) =60:10=6;
3) Х:(у*3) =(Х:у) *3=12:3=4;
4) (Х*2) :у=(Х:у) *2=10*2=20.