Ответ:
номер 3
1)
1,6+(5+3,4)= (1,6+3,4)+5= 5+5= 10
(2,41+13)+4,59= ( 4,59+2,41)+13 = 7+13= 20
2
0,3+(1,7+2,5)= (1,7+0,3)+2,5=2+2,5= 4,5
(3,8+6)+4,2= (3,8+4,2)+6= 8+6= 14
12,25+(8+3,75)= (12,25+3,75)+8=16+8= 24
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Ответ:
номер 3
1)
1,6+(5+3,4)= (1,6+3,4)+5= 5+5= 10
(2,41+13)+4,59= ( 4,59+2,41)+13 = 7+13= 20
2
0,3+(1,7+2,5)= (1,7+0,3)+2,5=2+2,5= 4,5
(3,8+6)+4,2= (3,8+4,2)+6= 8+6= 14
12,25+(8+3,75)= (12,25+3,75)+8=16+8= 24