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flume
@flume
July 2022
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ТУТ ОООЧЕНЬ ПРОСТО, ПОЖАЛУЙСТА
УПРОСТИТЕ ВЫРАЖЕНИЕ:
а) 5(x+1,4y)-0,8(2x+y)
б) [tex] \frac{2}{3} [/tex](x-y+z)-([tex] \frac{2}{3} [/tex]x-y+z)
НАЙДИТЕ ЗНАЧЕНИЕ ВЫРАЖЕНИЯ:
а) 3k+0,5(1-6k)-(7-6k) при k= 0,05; k= - 1,2
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Татьянка996
А) 5(х+1,4у)-0,8(2х+у)=5х+7у-1,6х-0,8у=3,4х+6,2у
б) (x-y+z)-(
x-y+z)= 2/3х-2/3у+2/3z-2/3x+2/3y-2/3z=0
3k+0,5(1-6k)-(7-6k) при k= 0,05; k= - 1,2
3k+0.5-3k-7+6k= 6k-6.5
k= 0,05, то 6k-6.5=6*0,05-6,5=0,3-6,5=-6,2
k= - 1,2, то 6k-6.5=6*(-1.2)-6.5=-13.7
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hlopushinairina
Б)2/3(x-y+z)-(2/3x-y+z)=2/3x-2/3y+2/3z-2/3x+y-z=1/3y-1/3z=1/3(y-z)
3k+0.5(1-6k)-(7-6k)=3k+0.5-3k-7+6k=6k-6.5;
k=0.05 ⇒6·0.05-6.5=0.3-6.5=-6.2;
k=-1.2 ⇒6·(-1.2)-6.5=-7.2-6.5=-13.7
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Answers & Comments
б) (x-y+z)-(x-y+z)= 2/3х-2/3у+2/3z-2/3x+2/3y-2/3z=0
3k+0,5(1-6k)-(7-6k) при k= 0,05; k= - 1,2
3k+0.5-3k-7+6k= 6k-6.5
k= 0,05, то 6k-6.5=6*0,05-6,5=0,3-6,5=-6,2
k= - 1,2, то 6k-6.5=6*(-1.2)-6.5=-13.7
3k+0.5(1-6k)-(7-6k)=3k+0.5-3k-7+6k=6k-6.5;
k=0.05 ⇒6·0.05-6.5=0.3-6.5=-6.2;
k=-1.2 ⇒6·(-1.2)-6.5=-7.2-6.5=-13.7