(7 4/13 -4 4/13): 0,15 - 4(13 6/13 +11 7 /13)= - id269065620211226 от DarkoRei 26.12.2021 09:35

Question

Математика: (7 4/13 -4 4/13): 0,15 - 4(13 6/13 +11 7 /13)=

DarkoRei · Accepted Answer

) 4(8+7х) –10х=8 32+28х-10х=8 28х-10х=8-32 8х=-24 х=-3 2) –2(–4+7х) +8х=3 8-14х+8х=3 -14х+8х=3-8 -6х=-5 х=1,2 3) 5х+3(–1–х) =–8х–8 5х-3-3х=-8х-8 5х-3х+8х=-8+3 10х=-5 х=-0,5 4) 3х–6(1+х) =–9х+9 3х-6-6х=-9х+9 3х-6х+9х=9+6 6х=15 х=2,5 5) –3х+5(–9+4х) =–х–4 -3х-45+20х=-х-4 -3х+20х+х=-4+45 18х=41 х=41/18 6) –6х–4(9–7х) =–5х+1 -6х-36+28х=-5х+1 -6х+28х+5х=1+36 27х=37 х=37/27 7)Х2–х–6=0 Д=1-4*(-6)=1+24=25 х1=1-5/2=-2 х2=1+5/2=3 8) Х2+3х=4 х2+3х-4=0 Д=9-4*(-4)=9+16=25 х1=-3-5/2=-4 х2=-3+5/2=1 9) Х2=2х+8...

(7 4/13 -4 4/13): 0,15 - 4(13 6/13 +11 7 /13)=

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