Câu 4 trang 59 vở bài tập Toán lớp 7 Tập 2:
a) ( 6x2 – 2x + 1) : ( 3x – 1 )
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b) ( 27x3 + x2 – x + 1) : ( –2x + 1)
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c) (8x3 + 2x2 + x) : (2x3 + x + 1)
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d) ( 3x4 + 8x3 – 2x2 + x + 1) : ( 3x + 1) ........................................................................................................................
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Lời giải:
a) ( 6x2 – 2x + 1) : ( 3x – 1 )
Vậy (6x2 – 2x + 1) : (3x – 1) = 2x ( dư 1).
b) ( 27x3 + x2 – x + 1) : (–2x + 1)
Vậy ( 27x3 + x2 – x + 1) : ( –2x + 1) = ( dư ).
c) (8x3 + 2x2 + x) : (2x3 + x + 1)
Vậy (8x3 + 2x2 + x) : (2x3 + x + 1) = 4 (dư 2x2 – 3x).
d) ( 3x4 + 8x3 – 2x2 + x + 1) : ( 3x + 1)
Vậy ( 3x4 + 8x3 – 2x2 + x + 1) : ( 3x + 1) = x3 + x2 – x + (dư ).