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angelinka0602
@angelinka0602
July 2022
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помогите пожалуйста..4 и 5
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Zaznajka2003
4.1)2a-1.5a+7.5a-3a=0.5a+4.5a=5a
a=2.75. 5*2.75=13.75
2)3a-1.5b+7a-8.5b=10a-10b
a=1.7. b=-4.3. 10*1.7-10*(-4.3)=17+47=64
3)-2(x-2y)+(9y+2x)=-2x+4y+9y+2x=4x+13y
x=0.64. y=1.5. 4*0.64+13*1.5=2.56+19.5=22.06
4)a(b-4)-b(a-3)=ab-4a-ab+3b=-4a+3b
a=2.5. b=-1/3. 4*2.5+3*(-1/3)=10-1=9
5.1.a)-3x+5x=2.4
2x=2.4
x=1.2
b)(3x-1)-(2x-5)=0
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angelinka0602
спасибо огромное
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Answers & Comments
a=2.75. 5*2.75=13.75
2)3a-1.5b+7a-8.5b=10a-10b
a=1.7. b=-4.3. 10*1.7-10*(-4.3)=17+47=64
3)-2(x-2y)+(9y+2x)=-2x+4y+9y+2x=4x+13y
x=0.64. y=1.5. 4*0.64+13*1.5=2.56+19.5=22.06
4)a(b-4)-b(a-3)=ab-4a-ab+3b=-4a+3b
a=2.5. b=-1/3. 4*2.5+3*(-1/3)=10-1=9
5.1.a)-3x+5x=2.4
2x=2.4
x=1.2
b)(3x-1)-(2x-5)=0