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4x& 31x

解:移项得: 4x² -31x-45=0 左边分解因式得: (4x+5)(x-9)=0 ∴4x+5=0 或 x-9=0 ∴x=-5/4 或 x=9 【很高兴为你解决以上问题,希望对你的学习有所帮助?≤、≥ ∠

负的三分之五

-45=27xx等于三分之五

4x²-45=31x 4x²-31x-45=0 (4x+5)(x-9)=0 x1=-5/4,x2=9 十字相乘: 4 5 × 1 -9

4(31-x)=100 31-x=100÷4 31-x=25 31-25=x 6=x x=6

4x²-31x-45=0 (4x+5)(x-9)=0 x=9;x=-5/4

32.4x31 +62x8.8 =32.4x31+31x17.6 =31x(32.4+17.6) =31x50 =1550

4X+3=31 X=28/4 X=7 那么7*7-8=49-8=41

=4x^6-32x^3+x^3-8 =4x^3(x^3-8)+(x^3-8) =(4x^3+1)(x^3-2^3) =(4x^3+1))(x-2)(x^2+2x+4)

=3.14*1.9+3.14*8.1 =3.14*(1.9+8.1) =3.14*10 =31.4

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