Ответ:
4.
а) (98+х)•2=396
98+х=396:2
98+х=198
х=198-98
х=100
б)(78+68)•х=420
140•х=420
х=420:140
х=3
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Ответ:
4.
а) (98+х)•2=396
98+х=396:2
98+х=198
х=198-98
х=100
б)(78+68)•х=420
140•х=420
х=420:140
х=3