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angelina0715
@angelina0715
August 2022
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Найдите S в двух задачах❤
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Sanyasha
1.
P=2(AB+BC)
AB=4BC
значит:
P=2(4BC+BC)
30=10BC
BC=3
AB=4*3=12
S=AB*BC=3*12=36
2.
AD:DC=2:1
P=36
AD=2DC
P=2(AD+DC)
P=2*(2DC+DC)
36=6DC
DC=6
AD=12
S=AD*DC=12*6=72
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Answers & Comments
P=2(AB+BC)
AB=4BC
значит:
P=2(4BC+BC)
30=10BC
BC=3
AB=4*3=12
S=AB*BC=3*12=36
2.
AD:DC=2:1
P=36
AD=2DC
P=2(AD+DC)
P=2*(2DC+DC)
36=6DC
DC=6
AD=12
S=AD*DC=12*6=72