Решите уравнения :
1) 3x-10.2=x
2) 3 ( x-15 ) + 30 = 12x
3) 3x-(5-x)=1
4) 5(x-4.3) = 7( x-0.5 )
5) 0.4x-(0.2x-3.2)=4.8
1) 3x-10.2=x
2) 3 ( x-15 ) + 30 = 12x
3) 3x-(5-x)=1
4) 5(x-4.3) = 7( x-0.5 )
5) 0.4x-(0.2x-3.2)=4.8
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Answers & Comments
3x-x-10.2=0
2x=10.2
x=10.2 : 2
x=5.1
2) 3(x-15) +30=12x
3x-45+30=12x
-45+30=12x-3x
-15=9x
x=-15 : 9
x=-1⅔
3) 3x-(5-x) =1
3x-5+x=1
3x+x=1+5
4x=6
x=6 : 4
x=1½
4) 5(x-4.3) =7(x-0.5)
5x-21.5=7x-3.5
5x-7x=-3.5+21.5
-2x=18
x=18 : (-2)
x=-9
5) 0.4x-(0.2x-3.2) =4.8
0.4x-0.2x+3.2=4.8
0.4x-0.2x=4.8-3.2
0.2x=1.6
x=1.6 : 0.2
x=8