Răspuns :
Răspuns: 1 859
Explicație pas cu pas:
a - 4 000 : 100 = 960
a - 40 = 960
a = 960 + 40
a = 1 000
_____________________
b × 5 + 50 × 8 = 4 400
b × 5 + 400 = 4 400
b × 5 = 4 400 - 400
b × 5 = 4 000
b = 4 000 : 5
b = 800
___________________
210 : 3 + c × 6 = 370
70 + c × 6 = 370
c × 6 = 370 - 70
c × 6 = 300
c = 300 : 6
c = 50
__________________
567 : 9 : d × 4 = 28
63 : d = 28 : 4
63 : d = 7
d = 63 : 7
d = 9
________________________________________________
a + b + c + d = 1 000 + 800 + 50 + 9 = 1 859
[tex]\it a-4000:100=960 \Rightarrow a-40=960\Big|_{+40} \Rightarrow a=1000\\ \\ \\b\times5+50\times8=4400 \Rightarrow b\times5+400=4400\Big|_{-400} \Rightarrow b\times5=4000\Big|_{:5} \Rightarrow b=800\\ \\ \\ 210:3+c\times6=370 \Rightarrow 70+c\times6=370\Big|_{-70} \Rightarrow c\times6=300\big|_{:6} \Rightarrow c=50\\ \\ \\[/tex]
[tex]\it 567:9:d\times4=28\Big|_{:4} \Rightarrow 63:d=7 \Rightarrow d=9\\ \\ \\ a+b+c+d=100+800+50+9=1859[/tex]