66,6*10-44,4*10+8,11=666-444+8,11=222-8,11=213,89
1)(х+408)-312=501
х=501+312-408
х=405
2)700-(45+у)=398
(45+у)=700-398
у= 302-45
у=257
3)650-(145-m)=533
(145-m)=650-533
m=145-117
m=28
4)(800-n)-661=89
(800-n)=89+661
(800-n)=750
n=800-750
n=50
а)128:100 = 1.28 * 25 = 32 + 128 = 160
б)128 : 100 = 1.28 * 34 = 43.52 + 128 = 171.52
в)128 : 100 = 1.28 * 1.2 = 1.536 + 128 = 129.536
г)128 : 100 = 1.28 * 3.4 = 4.352 + 128 = 132.352