а)(1/10+6/10)*15=7/10 *15=21/2=10,5
б)12*(8/12-3/12)=12* 5/12=5
в)1/10+3/20=2/20+3/20=5/20=1/4=0,25
г)5/2-15/30=5/2-1/2=4/2=2
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а)(1/10+6/10)*15=7/10 *15=21/2=10,5
б)12*(8/12-3/12)=12* 5/12=5
в)1/10+3/20=2/20+3/20=5/20=1/4=0,25
г)5/2-15/30=5/2-1/2=4/2=2