<em>2,46+а+81,139+14,8=98,399+а</em>
<span>a+26=83
а=83-26
а=57
.............</span>
<span>7z+6z-13=130
</span><span>7z+6z=130+13
13z=143
z=143:13
</span>z=11
Ответ: 11
а)78/338 = 26*3/26*13 = 3/13
б)700/840 = 140*5/140*6 = 5/6
в)255/525 = 15*17/15*35 = 17/35
г)324/405 = 81*4/81*5 = 4/5
д)84*108 <u> 2*7*6*2*3*9*2</u>
______ = 6*2*2*2*7*9*2 = 3/2 = 1 целая 1/2
48*126
е)96*35*110 <u>8*3*4*35*11*10</u>
_________ = 3*11*8*10*3*35 = 4/3 = 1 целая 1/3
33*80*105