Одна вторая=0,5
0,5^3=0,5*0,5*0,5=0,125
19у-7у=144
12у=144
у=12
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(3.8+4.22-3.02)z-7.25=0
5z-7.25=0
5z=0+7.25
5z=7.25
z=7.25:5
z=1.45
2)
17.3 - 100%
x - 34%
x = (17.3 * 34)/100= 5.8%
1)
3x + 4x = 98
7x = 98
x = 14
3 * 14 = 42
25/49*21/50=1/7*3/2=3/14
45/64:81/96=45/64*96/81=5/8*12/9=60/72=5/6