Х+(х+43)=215
2x=215-43
2x=172
x=172/2
x=86
-----------------------
86+(86+43)=215
<span> 215=215
х+(6534+241)=(4173+6534)+241
х+6775=10707+241
х+6775=10948х=10948-6775=4173
Проверка:4173+(6534+241)=(471+6534)+241
4173+6775=10707+241
<span>10948=10948
</span></span>6598*X=2379*6598
6598*Х=15675231
Х=15675231:6598
<span>Х=2379</span>
<span>4 целых 3/10+ 1 целая 2/15 = 43/10 + 17/15 = 129/30 + 34/30 = 163/30 = 5 целых 13/30
</span><span>1 целая 7/15 - 1/3 = 22/15 - 1/3 = 22/15 - 5/15 = 17/15 = 1 целая 2/15
</span><span>3/8*2 целых 2/3 = 3/8 * 8/3 = 1
</span><span>7/9:2/3 = 7/9 * 3/2 = 7/5 = 1целая2/5 = 1,4
</span>5/6:2/3 = <span>5/6*3/2 = 5/4 = 1целая1/4 = 1,25</span>
KLMN-73 см.
KL-18 см.
LM-b см.
MN-? см.
Решение
1)18+b(см)- KL и LM
2)73-(18+b)=73-18+b=55+b(см)-MN