6a²b²+(3ab²-2a²b²)-(4a²b²+ab²)-2ab<span>²=
=6a</span>²b²+(ab²(3-2a))-(ab²(4a+1))-2ab<span>²=
=6ab</span>²+ab²(3-2a)-ab²(4a+1)-2ab<span>²=
=ab</span><span>²(6a+3-2a-4a+1-2)=
=2ab</span><span>²</span>
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7n2+21n-n-3-7n2-28n=-8n-3
-8*(-1.3/8)-3=-8*(-11/8)-3=11-3=8
Ответ:
Объяснение:
№221:1/3a^2*3a^2b=a^4b=(-4)^4*5/7=256*5/7=1280/7=182(далее дробная часть)6/7
2/5mn*10n^2=4mn^3=64*4*0.8=204.8
№222: S=1/5a*10b=2ab
S:=3/7x*14y=6xy