Ответ:
15а•4=60а
3в•12=36в
17а•5=85а
11а•7=77а
21d-18d+3=3d+3
14a+a+9+4=15a+13
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Ответ:
15а•4=60а
3в•12=36в
17а•5=85а
11а•7=77а
21d-18d+3=3d+3
14a+a+9+4=15a+13