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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?≤、≥ ∠

4x²-31x=45 4x²-31x-45=0 (4x+5)(x-9)=0 x=﹣5/4,x=9

负的三分之五

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

4x²-45=31x公式法怎么解 解: 4x²-45=31x 4x²-31x-45=0 Δ =31²+4×4×45=1681 x=(31±√ 1681)/8 x=(31±41)/8 x1=9,x2=-5/4

646797

x=11

是x平方+4x-5=0 x平方+12x+27=0 4x平方-45=31x吧。 x平方+4x-5=0 (x+5)(x-1)=0 x1=-5 x2=1 x平方+12x+27=0 (x+3)(x+9)=0 x1=-3 x2=-9 4x平方-45=31x 4x²-31x-45=0 (4x+5)(x-9)=0 4x+5=0 x=-5/4 x-9=0 x=9

(1)4.5×6+4x=41, 27+4x=41, 27+4x-27=41-27, 4x=14, 4x÷4=14÷4, x=3.5;(2)7x-3.4x=0.72, 3.6x=0.72, 3.6x÷3.6=0.72÷3.6, x=0.2;(3)2x+1.5x=42, 3.5x=42, 3.5x÷3.5=42÷3.5, x=12;(4)(x-4.5)×6=31.8, 6x-27=31.8, 6x-27...

314x0.043+3.14x7.2-31.4x0.15 =31.4✘(0.43+0.72-0.15) =31.4✘1 =31.4

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