1)500 -а=с (кг) продали до перерыва
2) с-в=д(кг) муки осталось
6* x = 60000 : 1
6 * x = 60000
x =60000 :6
x =10000
900:x =50 *6
900 :x =300
x= 3
100*x = 360 + 640
100* x = 1000
x= 10
420 - x = 490 : 7
420 - x = 70
x = 420 - 70
x= 350
Х+(8-3х)=12
8-3х=12-х
-3х+х=12-8
-2х=4
х=4:(-2)
х=2
1) 51*5/17+51*11/17=51*(5/17+11/17)=51*16/17=3*16=48
2)22*7/11-22*6/11=22(7/11-6/11)=22*1/11=1
3)11/13*11/15+11/13*2/15=11/13*(11/15+2/15)=11/13*13/15=11/15
4)12/19*23/15-12/19*4/15=12/19*(23/15-4/15)=12/19*19/15=12/15
5)11/21*5/14+17/21*5/14=5/14*(11/21+17/21)=5/14*28/21=5/1*2/21=10/21
6)47/66*1/2-25/66*1/2=1/2*(47/66-25/66)=1/2*22/66=11/66=1/6