Ответ:
1)АВ=АС-ВС=7,81-4,2=3,61cm
2)
A)
(y-8,42)+3,14=5,9
y-8,42=5,9-3,14
y=2,76+8,42=11,18
B)
(7,89+x)-13,235=8,26
7,89+x=8,26+13,235
x=21,495-7,89=13,605
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Ответ:
1)АВ=АС-ВС=7,81-4,2=3,61cm
2)
A)
(y-8,42)+3,14=5,9
y-8,42=5,9-3,14
y=2,76+8,42=11,18
B)
(7,89+x)-13,235=8,26
7,89+x=8,26+13,235
x=21,495-7,89=13,605