234 + 173
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?
234+173=407(ящ)- в магазине первоначально
1) 6a* (-2b) * (-c) = -12ab * -c = 12abc
3) -0,5a * -7b * -2c = 3,5ab * - 2c = - 7abc
1) 12(x + 3) -54 - 21 = 12x + 36 - 75 = 12x - 41
при х = 0,5 12х - 41 = 12*0,5 - 41= 6 - 41 = - 35
3) = 3,6х + 2,7 - 1,6х + 0,3 = 2х + 3
при х + - 1 2х + 3 = -2 +3 = 1.
X:1 1/7=5 3/5:1 3/5
X:8/7=28/5:8/5=28/5•5/8=7/2
X:8/7=7/2
X=7/2•8/7=4(см)высота зала
Ж) 7/11 * (3/7 + 5/7) = 7/11 * 8/7 = 8/11
1) 3/7 + 5/7 = 8/7
2) 7/11 * 8/7 = (1*8)/(11*1) = 8/11
з) (7/12 - 3/16 - 5/24) + 1/4 = 7/16
1) 7/12 - 3/16 = 28/48 - 9/48 = 19/48
2) 19/48 - 5/24 = 19/48 - 10/48 = 9/48 = 3/16
3) 3/16 + 1/4 = 3/16 + 4/16 = 7/16