3/4x+2/4-2/3x+1/3=2
3/4x-2/3x+2/4+1/3=2
9/12x-8/12x+6/12+4/12=2
1/12x+10/12=24/12
1/12x=24/12-10/12
1/12x=14/12
x=14/12*12/1
x=168/12
x=14
1) 1,4/1,6 = 0,875
0,875*100% = 87,5 %
2) 0,7/0,9 = 0,77777...8*100% = 77,78%
3) 9/26 = 0,346153846.....*100% = 34,62%
Х*х*х+38=5*13
х*х*х=27=3*3*3
х=3
Х+х+1060 = 3020
2х+1060=3020
2х=3020-1060
2х= 1960
х= 1960:2
х = 980 ( см ) - 2 часть
2) 980 + 1060 = 2040( см) - 1 часть
2040 см = 2 м 40 см
80=8×10=2^4×5
75=15×5=3×5^2
52=26×2=13×2^2