1. Решите удобным способом:
21*55+79*55=
109*16-9*16=
9*134-9*34=
27*19+19*73=

2.Расскройте скобки:
(m+3)*5=
9*(2+x)=
(3y+2)*4=
(5a+8)*2=
(7m-3)*6=

3.Вычислите пр аброзцу:
Образец:
69*6=(70-1)*6=70*6 -1*6=420-6=414
____________
39*8=
73*9=

помогите!!!
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