Question

решите уравнение. 1) 3 (1,2x-4)=1,2 -0,4x
2) 2,4x-6=-1,2x+19,2
3) 4 (0,7x-4)-3 (-0,2x+6)

Answer 1

3*(1.2x-4)=1.2-0.4x
3.6x-12=1.2-0.4x
3.6x+0.4x=1.2+12
4x=13.2
x=13.2/4
x=3.3
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2.4x-6=-1.2x+19.2
2.4x+1.2x=19.2+6
3.6x=25.2
x=25.2/3.6
x=7
==============
4*(0.7x-4) = 3 * (-0.2x+6)
2.8x-16=-0.6x+18
2.8x+0.6x=18+16
3.4x=34
x=34/3.4
x=10

Answer 2

Спасибо