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(520-516)×a÷(3×3+8÷8×21)+398=410

Răspuns :

(520-516)*a:(3*3+8:8*21)+398=410

4*a:(9+1*21)+398=410
4a:30+398=410
4a:30=410-398
4a:30= 12
4a=12*30
4a=360
a=360:4
a= 90
(520-516)•a:(3•3+8:8•21)+398=410

4• a : (9+1•21)+398=410
4 • a: (9+21)+398=410
4 • a:30+398=410
4 • a: 30=410-398
4 • a: 30=12
4 • a=30•12
4 • a=360
a=360 : 4
a=90
P: (520-516)•90:(3•3+8:8•21)+398=410.
Sper ca te-am ajutat! ;)