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x=0,4+2*0,4x
x=0,4+0,8x
0,2x=0,4 /÷0,2
x=2
Ryba ważyła 2 kg.
4)
12*4\3-[21\15*45\21-(13\1-268\21)*(-21\5)
-------------------------------------------------------------- =
1\4*2\1+28\15*15\8
16-3-(273\21-268\21)*(-21\5)
----------------------------------------- =
1\2+7*1\2
13-5\21*(-21\5)
---------------------- = 13\4
1\2+7\2
6)
x-(0,3x+2+ x-0,3x-2 \ 2+3=10 /*2
2x-(0,6x+4+x-0,3x-2+6=20
2x-(1,3x+8)=20
2x-1,3x-8=20
0,7x=28 /÷0,7
x=28\0,7
x=40