22%=0,22
30%=0,3
500*0,22=110
300*0,3=90
110 + 90 = 200
500 + 300 = 800
дробь 200/800 *100%=20%
800 и 100 надо сокращать
1. 390 : (4х + 3) = 26 2. 528 : (5х - 7) = 16
4х + 3 = 390 : 26 5х - 7 = 528 : 16
4х + 3 = 15 5х - 7 = 33
4х = 15 - 3 5х = 33 + 7
4х = 12 5х = 40
х = 12 : 4 х = 40 : 5
х = 3 х = 8
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3. 594 : (8х - 55) = 18 4. 735 : (6х + 17) = 21
8х - 55 = 594 : 18 6х + 17 = 735 : 21
8х - 55 = 33 6х + 17 = 35
8х = 33 + 55 6х = 35 - 17
8х = 88 6х = 18
х = 88 : 8 х = 18 : 6
х = 11 х = 3
1. 390 : (4х + 3) = 26 2. 528 : (5х - 7) = 16
4х + 3 = 390 : 26 5х - 7 = 528 : 16
4х + 3 = 15 5х - 7 = 33
4х = 15 - 3 5х = 33 + 7
4х = 12 5х = 40
х = 12 : 4 х = 40 : 5
х = 3 х = 8
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3. 594 : (8х - 55) = 18 4. 735 : (6х + 17) = 21
8х - 55 = 594 : 18 6х + 17 = 735 : 21
8х - 55 = 33 6х + 17 = 35
8х = 33 + 55 6х = 35 - 17
8х = 88 6х = 18
х = 88 : 8 х = 18 : 6
х = 11 х = 3
m1(в-ва) = m1(p-pa)*w1 = 500 * 0,22 = 110(г)
m2(в-ва) = m2(р-ра)*w2 = 300 * 0,3 = 90(г)
m3(в-ва) = m1(в-ва) + m2(в-ва) = 110 + 90 = 200(г)
m3(р-ра) = m1(p-pa) + m2(p-pa) = 500 + 300 = 800(г)
w3 = (m3(в-ва)/m3(p-pa))*100% = (200/800)*100% = 25%