Ответы 2
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2x=2+2*2
2x=2+4
2x=6
x=6/2
x=3
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Автор:
wags - 6 лет назад
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0
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2x=2+2*2
2х=2+4
2х=6
х=3
Ответ: 3
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Автор:
travisryan - 6 лет назад
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0
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there aretwo major branches of
the seed plants:the gymnosperms
and the angiosperms.
theangiosperms,in turn are
subdivided into monocotyledons
(single seed leaf)dicotyledons
two seed leaves. Since a
dicotyledon leaf includes almost
all thestructures to be found in
the other two,it will be described.
the usual type ofa thin leaf of a
dicotyledon has several rather
definite parts. the broad
flatexpansion is the blade. almost
always there is the network of
the lines toexpand in all
directions in the blade. these are
the veins. usually either alarge
vein, the midrib, extends the
entire length of the blade or
severalradiating branches replace
it. thesystem of veins brings
water and minerals into the leaf
and carries away thefoods to be
synthesized there..the blade is
usually attached to the stem of
theplant by a slender leaf stalk or
petiole.petioles vary greatly in
length indifferent species,
sometimes being very short or
entirely lacking. at the baseof
petiole, where it is attached to
the stem- there are frequently
two smallappendages sometimes
to look like rudimentary leaves.
these are the stipules.the leaves
of a majority of plants have no
stipules and in considerable
number theyare present when
the leaf is young but soon fall off.
any part of a plant to besupplied
with water and carbon dioxide
and which contains chlorophyll
so locatedthat it can be reached
by light may carry on
photosynthesis of all
plantstructures. the broad,flat
comparatively thin blade is the
mostefficient organ of
photosynthesis in existence.
It is so constructed that a
greater part ofsurface in
proportions to its actual volume
as exposed to air and light and
itis thin enough to permit
ample light to reach almost
every cell.in additioninternal
structure is so organized that
carbon dioxide and water can
reachevery cell.
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