решите уравнение срочно
1) 5в+28=4в+21
2) 4(2-0,5а)= -2(4+2а)
3) 3y-22=8y+28
4) 1+5(1,5-1,4x)=5-7,5x
1) 5в+28=4в+21
2) 4(2-0,5а)= -2(4+2а)
3) 3y-22=8y+28
4) 1+5(1,5-1,4x)=5-7,5x
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Answers & Comments
5b-4b=21-28
b=-7
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2)4(2-0,5a)=-2(4+2a)
8-2a=-8-4a
-2a+4a=-8-8
2a=-16
a=-8
3)3y-22=8y+28
3y-8y=28+22
-5y=50
y=-10
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4)1+5(1,5-1,4x)=5-7,5x
1+7,5-7x=5-7,5x
8,5-7x=5-7,5x
-7x+7,5x=5-8,5
0,5x=-3,5
5x=-35
x=-7
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5в-4в=-28+21
в=-7
4(2-0,5а)= -2(4+2а)
8-2а=-8-4а
-2а+4а=-8+8
-2а=0
3у-22=8у+28
3у-8у=22+28
-5у=50
у= 50 :(-5)
у=10
1+5(1,5-1,4х)=5-7,5х
1+7,5-7х=5-7,5х
-7х+7,5х=-1-7,5+5
0,5х= 3,5
х=3,5÷0,5
х=7