Răspuns :
3/177
a)Ppatrat=4*l
P=4*2,6
P=10,4
b)Pdreptunghi=2*L+2*l
P=2*5,25+2*3,175
P=10,5+6,35
P=16,85
4/177
a)Ppatrat=4*l =>l=7:4 l=1,75
b)Pdreptunghi=2*L+2*l
59=2*19+2l
59=38+2l => 2l=59-38
2l=21
l=10,5
a)Ppatrat=4*l
P=4*2,6
P=10,4
b)Pdreptunghi=2*L+2*l
P=2*5,25+2*3,175
P=10,5+6,35
P=16,85
4/177
a)Ppatrat=4*l =>l=7:4 l=1,75
b)Pdreptunghi=2*L+2*l
59=2*19+2l
59=38+2l => 2l=59-38
2l=21
l=10,5
a)Ppatrat=4l⇒P=4·2,6⇒P=10 cm
b)Pdreptunghi=2(L+l)⇒P=2(5,25+3,175)⇒P=2·8,425⇒P=16,85
a)P=7dm l=?
inlocuim; 7=4L⇒L=7÷4⇒L=1,75dm
b) l=? L=19cm Pdreptunghi=59
P=2(L+l)⇒19=2(19+l)⇒19=38+2 l⇒2 l=38-19⇒2 l=19⇒l=19÷2⇒l=9,5
l-- este latimea
b)Pdreptunghi=2(L+l)⇒P=2(5,25+3,175)⇒P=2·8,425⇒P=16,85
a)P=7dm l=?
inlocuim; 7=4L⇒L=7÷4⇒L=1,75dm
b) l=? L=19cm Pdreptunghi=59
P=2(L+l)⇒19=2(19+l)⇒19=38+2 l⇒2 l=38-19⇒2 l=19⇒l=19÷2⇒l=9,5
l-- este latimea