Ответ:
а) (48+k)×8=400
48+k=400÷8
48+k=50
k=48-50
k=-2
б)3×(х+1)-12=24
3×(х+1)=24+12
3×(х+1)=36
х+1=36÷3
х+1=12
х=12-1
х=11
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Ответ:
а) (48+k)×8=400
48+k=400÷8
48+k=50
k=48-50
k=-2
б)3×(х+1)-12=24
3×(х+1)=24+12
3×(х+1)=36
х+1=36÷3
х+1=12
х=12-1
х=11