а)6,315
б)0,092
(21-13,16)*0,6= 7,87*0,6= 4,704
х+4,91=8
х=8-4,91
х=3,09
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а)6,315
б)0,092
(21-13,16)*0,6= 7,87*0,6= 4,704
х+4,91=8
х=8-4,91
х=3,09