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0.96x+1.8y=87的解是多少

0.96x + (60-x)*1.8 = 870.96x + 108 - 1.8x = 870.96x-1.8x = 87-108-0.84x = -21x = 25

0.96x=9.85解:x=9.85/0.96=985/96

1.2*0.8X+2*0.9(60-X)=87的解?0.96X+1.8(60-X)=870.96X+108-1.8X=87108-0.84X=870.84X=108-870.84X=21 X=25

分四步求解:1)首先把小数转化为整数方程两边同时放大1000倍:1000x-960x+256=0再同时除以8: 125x-120x+32=02)换元,以便简化算式和容易因式分解令u=5x,则: u-24u+32=03)因式分解u-16u-8u+32=(u-16u)-(8u-32)=u(u-16)-8(u-4)=u(u+4)(u-4)-8(u-4)=(u-4)(u+4u-8)4)求解(u-4)(u+4u-8)=0则u-4=0,或u+4u-8=0即:u1=4u2=-2+2√3u3=-2-2√3最后,根据u=5x计算x值得:x1=4/5x2=2(√3-1)/5x3=-2(√3+1)/5

(x+80)÷0.96=0.96x+80*2解:X+80=0.96*(0.96X+160)(1-0.9216)X=153.6-80X=938.78

N个解,有限的,算吧

x=7.5*0.64/0.96 最后得到x=5

x=0.6

用一元三次方程的万能公式范盛金公式 三次方程新解法盛金公式解题法 A new means to solving a problem in mathematics on the cubic equations in Shengjin's formulas Shengjin's Formulas and Shengjin's Distinguishing Means

x看成是1*x,所以1*x-0.8x=(1-0.8)x= 0.2x.再等式两边同除以0.2

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