Question

Решите 2 уравнение:
1)87100:(870+х)=100
2)3*(0,2х-5)-4*(0,3-5)=10+0,4х
Ответы:
1)1
2)31

Answer 1

$1)87100:(870+x)=100 \ 870+x=87100:100 \ 870+x=871 \ x=871-870 \ x=1$

$2)3*(0.2x-5)-4*(0.3-5)=10+0.4x \ 0.6x-15-4*(-4.7)=10+0.4x \ 0.6x-15+18.8=10+0.4x \ 0.6x-0.4x=10+15-18.8 \ 0.2x=6.2\x=6.2:0.2\x=31$