811 Вычислите :
а) 1/5+3/5 б)1/2 + 1/2 в) 7/10 + 4/10 г) 3/8 + 5/8 д) 5/16+ 3/16 е) 3/10 + 7/20
1/5+3/5=4/5
1/2+1/2=2/2=1
7/10+4/10=11/10=1 1/10
3/8+5/8=8/8=1
5/16+3/16=8/16=1/2
3/10+7/20=13/20
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1/5+3/5=4/5
1/2+1/2=2/2=1
7/10+4/10=11/10=1 1/10
3/8+5/8=8/8=1
5/16+3/16=8/16=1/2
3/10+7/20=13/20