Question

Решите уравнения. (100+a)*2=800, 469+(x-342)=921

Answer 1

(100+а)*2=800
100+а=800:2
100+а=400
а=400-100
а=300

469+(х-342)=921
х-342=921-469
х-342=452
х=452+342
х=794

Answer 2

(100+а)×2=800. проверка
100+а=800÷2. (100+300)×2=800.
100+а= 400. 400×2=800
а= 400-100. 800=800
а= 300

469+(х-342)=921
(х-342)=921-469
(х-342)= 452
х= 452+342
х=794

469+(794-342)=921
469+452=921
921=921