Решите плиз 1) 9,38-(-10+5,38) 2) -8,76-(-3,25-10,76) 3)-6,19+(-1,5+5,19) 4)-(-21,4+12,7)+(20,4+12,7)
benka2
1)9,38+10-5,38=9,38+4,62=14
2)-8,76+3,25+10,76=-8,76+14,01=5.25
3)-6,19-1,5+5,19=-7,69+5,19=-2,5
4)21,4-12,7+20,4+12,7=41,8
1)
/////////////////////////////////////////////
--------(1)-------------------(2,5)--------------
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x∈(2,5;∞)
2){x≥1,5
{x≤3
//////////////////////////////////////////////////////
---------[1,5]----------------------[3]---------------
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
x∈[1,5;3]
3
/////////////////////////////////////////////////////
------------(-2)---------------------(-1,5)----------------
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x∈(-2;-1,5)
4
{5x<5⇒x<1
{x<12
\\\\\\\\\\\\\\
---------(1)---------------------(12)-----------
///////////////////////////////////////////
x∈(-∞;1)
5
{x≤15
{x≥6
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
--------[6]------------------[15]-----------
/////////////////////////////////////////
x∈[6;15]
6
{x>0
{x≥-7
/////////////////////////////////////////////
----------[-7]--------------------(0)----------------
\\\\\\\\\\\\\\\\\\
x∈(0;∞)
<span>(12500+12600+12550+12650+12450)/5=62750/5=12550</span>
Х + Х * 3 = 28
4х = 28
х=28:4
х=7 - в одном кармане
<span>3*7=21 - во втором кармане </span>
1 поезд ежедневно перевозит по 635 человек, а 9 поездов 5715. значит:
5715*7= 40005
