Question

0,8(4a+3b) -6(0, 5a+0, 8a) при a=1, b=-4​

Answer 1

$0,8(4\cdot1+3\cdot(-4))-6(0,5\cdot1+0,8\cdot1)=0,8(4+3\cdot(-4))-6(0,5+0,8)=0,8(4-12)-6\cdot1,3=0,8\cdot(-8)-7,8=-6,4-7,8=-14,2$