Question

0,4(5b-4)-3,4+0,6d при d=5

Answer 1

$2) 3.5(3-4b)-5.7+8b=10.5-14b-5.7+8b=4.8-6b\b=1.3\4.8-6*1.3=4.8-7.8=-3 \ \ 4)0.4(5d-4)-3.4+0.6d=2d-0.16-3.4+0.6d=\=1.2d-3.56\d=5\1.2*5-3.56=6-3.56=2.44$