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Molya61
@Molya61
July 2022
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Сначала нужно сократить а потом поставить цифру на место и решить.
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sedinalana
Verified answer
1
(2x-y)³+3(2x-y)²=(2x-y)²(2x-y+3)
(2,2-1,2)²(2,2-1,2+3)=1*4=4
2
3(m-1)²+m³+8-(m+1)²
3*(-1/3-1)²+(-1/3)³+8-(-1/3+1)²=3*16/9-1/27+8-4/9=48/9-1/27+8-4/9=
=44/9-1/27+8=132/27-1/27+8=131/27+8=4 23/27+8=12 23/27
3
(a-1)³-4a(a²-1)+3(a³-1)
(-2-1)³-4*(-2)*(4-1)+3(-8-1)=-27+24-27=-30
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Answers & Comments
Verified answer
1(2x-y)³+3(2x-y)²=(2x-y)²(2x-y+3)
(2,2-1,2)²(2,2-1,2+3)=1*4=4
2
3(m-1)²+m³+8-(m+1)²
3*(-1/3-1)²+(-1/3)³+8-(-1/3+1)²=3*16/9-1/27+8-4/9=48/9-1/27+8-4/9=
=44/9-1/27+8=132/27-1/27+8=131/27+8=4 23/27+8=12 23/27
3
(a-1)³-4a(a²-1)+3(a³-1)
(-2-1)³-4*(-2)*(4-1)+3(-8-1)=-27+24-27=-30