Toán Lớp 8: Rút các biểu thức sau:
a/ xᒾy–y+xyᒾ–x
b/ (2x–3)ᒾ – 2(4xᒾ–9) + (2x–3)ᒾ
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Toán Lớp 8: Rút các biểu thức sau:
a/ xᒾy–y+xyᒾ–x
b/ (2x–3)ᒾ – 2(4xᒾ–9) + (2x–3)ᒾ
Comments ( 1 )
=xy(x+y)-(x+y)
=(xy-1)(x+y)
b)(2x-3)²-2(4x²-9)+(2x-3)²
=(2x-3-2x+3)²
=0