Объяснение:
1
4а-15b-2
a=5/6
b=2/45
4×5/6-15×2/45-2=
=10/3-2/3-2=(10-2-6)/3=2/3
2
7,4a+2,66-(2,5a-3,7a)=
=7,4a+2,66-2,5a+3,7a=
=8,6a+2,66
3
3(4х-у)+4(2х+3у)-5(6х-2у)=
=12х-3у+8х+12у-30х+10у=
= - 10х+19у
Х=2
У= - 1
-10×2+19×(-1)= - 20-19= - 39
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Answers & Comments
Объяснение:
1
4а-15b-2
a=5/6
b=2/45
4×5/6-15×2/45-2=
=10/3-2/3-2=(10-2-6)/3=2/3
2
7,4a+2,66-(2,5a-3,7a)=
=7,4a+2,66-2,5a+3,7a=
=8,6a+2,66
3
3(4х-у)+4(2х+3у)-5(6х-2у)=
=12х-3у+8х+12у-30х+10у=
= - 10х+19у
Х=2
У= - 1
-10×2+19×(-1)= - 20-19= - 39