Найдите значение выражения
(3/4+2 целые 3/8)*25,8
В дробях
3/4+ 2ц 3/8= 3/4+ (8•2+3)/8= 80 5/8
1)) 3/4+ 19/8= (3•2)/(4•2) + 19/8=
6/8+ 19/8= 25/8
2)) 25/8• 25,8= 25/8• 25 8/10=
25/8• 25 4/5= 25/8• (25•5+4)/5=
25/8• 129/5= (25•129)/((8•5)=
3225/40= 80 25/40= 80ц 5/8.
В десятичных
(3/4+2ц3/8)•25,8=80,625
3/4=3:4= 0,75;
2ц 3/8= (8•2+3)/8=19/8= 2,375;
1)) 0,75+2,375= 3,125
2)) 3,125•25,8= 80,625.