Ответ:
a7=a1×6d=8×6×(-12)= -576
a20=a1×19d= -1824
a101= a1×100d= -9600
a220=a1×219d = -21024
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Ответ:
a7=a1×6d=8×6×(-12)= -576
a20=a1×19d= -1824
a101= a1×100d= -9600
a220=a1×219d = -21024