1) 30*30*30-40*40=25400
30*30*30=27000
40*40=1600
27000+1600=25400
2) (6а+7b)*14=84a+98b
6a*14=84a
7b*14=98b
84a+98b
3) 10*(14x-27y+5)=140x-270y+50
10*14x=140x
10*27y=270y
10*5=50
4) 23y+35+15y-15=38y+20
23y+15y=38y
35-15=20
1) 30*30*30-40*40=25400
30*30*30=27000
40*40=1600
27000+1600=25400
2) (6а+7b)*14=84a+98b
6a*14=84a
7b*14=98b
84a+98b
3) 10*(14x-27y+5)=140x-270y+50
10*14x=140x
10*27y=270y
10*5=50
4) 23y+35+15y-15=38y+20
23y+15y=38y
35-15=20
(6а+7b)×14=6а×14+7b×14=84a+98b
10×(14x-27y+5)=10×14x-10×27y+10×5=140x-270y+50
23y+35+15y-15=38y+20=2(19y+10)