<span>2(4x+5)-11=7(3-5x)
8x + 10 - 11 = 21 - 35x
8x - 1 = 21 - 35x
8x + 35x = 21 + 1
43x = 22
x = 22/43
</span>
S=пr²
r=d:2=10:2=5 (см)
S=3,14×5²=78,5 (см²)
= (11/12+ (11х3)/(4х3) ) х119/56 +(25х13х11)/(8х7х9)=
( (11+33)/12 ) х119/56+ 3575/504= (44/12)х119/56+ 3575/504= (сокр. 44/12 на 4→11/3)= (11х119)/(3х56) +375/504= 1309/168+375/504=
=(1309х3)/(168х3) +375/504= (3927+375)/504= 4302/504=→сокр на 18=
=239/28=8_15/28
Х+4х =32
5х=32
х=6,4кг в первой
4*6,4= 25,6кг во второй