Ответ:
8)2n+n+17-5=(3n+12)/3=n+4
9) ab²=7/2.
-6ab²=-6×7/2=-21
2а²b⁴=2×(7/2)²=2×49/4=49/2=24,5
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Ответ:
8)2n+n+17-5=(3n+12)/3=n+4
9) ab²=7/2.
-6ab²=-6×7/2=-21
2а²b⁴=2×(7/2)²=2×49/4=49/2=24,5