Найдите значение выражения: а)7 1/3+5 3/5
б)6 2/3-1 2/5
в)3 3/4+4 7/9
г)20 5/6-2 3/4
д)39 5/9-4 1/6
е)11 5/8+8 5/6
ж)(2/7+3 1/4)-(11/14+13/28)
з)(8 7/12-2 5/8)-(3 7/12-1 1/3)
б)6 2/3-1 2/5
в)3 3/4+4 7/9
г)20 5/6-2 3/4
д)39 5/9-4 1/6
е)11 5/8+8 5/6
ж)(2/7+3 1/4)-(11/14+13/28)
з)(8 7/12-2 5/8)-(3 7/12-1 1/3)
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Answers & Comments
б)6 2/3- 1 2/5=20/3-7/5= 20*5-7*3/15=100-21/15=79/15= 5 4/15
в)3 3/4+4 7/9=15/4+43/9=15*9+43*4/36=135+172/36=307/36= 8 19/36
г)20 5/6-2 3/4=125/6-11/4= 125*2-11*3/12=250-33/12=217/12=18 1/12
д)39 5/9-4 1/6= 356/9- 25/6= 356*2-25*3/18=712-75/18=637/18=35 7/18
е)11 5/8+ 8 5/6= 93/8+53/6=93*3+53*4/24=279+212/24=491/24= 20 11\24
ж)(2/7+3 1/4)-(11/14+13/28)=(2/7+13/4)-(11/4+13 /28)= (4*2+13*7/28)-(7*11+13*1/28)=99/28-90/28=9/28
з)(8 7/12-2 5/8)-(3 7/12-1 1/3)=(103/12-21/8)-(43/12-4/3)=(103*2-21*3/24)-(43*1-4*4/12)=143/24-27/12=143-54/24=89/24= 3 17/24