-43-54+26= -71
47-(-20-(-15)= 47 - (-20+15) = 47+20-15=52
33-16-(-11)= 33-16+11=28
-72+5-45-32=-67-45-32=-112-32=-144
.........................
x + 4y = 0.79
y + 5x = 1.385
x = 0.79-4y, следовательно, y + 5(0.79-4y) = 1.385
y + 3.95 - 20y = 1.385
19y = 3.95 - 1.385
19y = 2.565
y = 2.565/19
y = 0.135
x = 0.79 - 4*0.135
x = 0.25
x+y = 0.25 + 0.135
x+y = 0.385
Ответ: 0.385 кг
450*3-x=982
1350-x=982
x=1350-982
x=368
Ответ:368
99 ÷ 9 - 66 ÷ 6 + 3 + 3 + 3 = 11 - 11 + 3 + 3 + 3 = 9