3x²-4x 7=0-搜答案-智慧作业帮

#include"stdafx.h"#include"iostream"#include<stdio.h>#include<stdlib.h&

1/3x=1/4*1/5,x=3/201/2x=3/7*（）你数字没给,自己算.

4x-6x7.2=9.84x-43.2=9.84x=9.8+43.24x=53x=53÷4x=13.25

f（x）=x7-2x6+3x3-4x2+1=（（（（（（x-2）x+0）x+0）x+3）x-4）x+0）x+1故v4=（（（x-2）x+0）x+0）x+3当x=2时，v4=（（（2-2）2+0）2+0

1/(1x4)+1/(4x7)+1/(7x10)+...+1/(3n-2)x(3n+1)]=1/3*(1-1/4+1/4-1/7+.+1/(3n-2)-1/(3n+1))=1/3*(1-1/(3n+1

100x(3/1x4+3/4x7+3/7x10+.3/97x100)=100x[(1-1/4)+(1/4-1/7)+(1/7-1/10)+……+(1/97-1/100)]=100x[(1+1/4+1/

f(3)=((((((7*3+6)*3+5)*3+4)*3+3)*3+2)*3+1)*3

-10.5x（-6分之1-4分之1）x7分之3除以（-0.5）=10.5x（6分之1+4分之1）x7分之3×(-2)=10.5x12分之5x7分之3×(-2)=10.5x7分之3x12分之5×(-2)

1X+X2+X3+X4+X5+X6+X7+X8=X(1+X+X2+X3)+X5(1+X+X2+X3)=0+0=02a2+b2+4a-6b+13=(a2+4a+4)+(b2-6b+9)=(a+2)2+(

（4.5-x）x7=17.54.5-x=17.5÷7=2.5x=4.5-2.5x=2

2.7x+3=97.52.7x=97.5-3x=94.5÷2.7x=350.95÷0.4x=1.90.4x=0.95÷1.9x=0.5÷0.4x=1.256.8+x=24.5x=24.5-6.8x=1

53/582再问：怎么算的啊？再答：x7=85/6x1+x2.....+x10=971/685/6/971/6=53/582

7^4-3x7^2-8x7^3化简

7^4-3x7^2-8x7^3=7^2x(7^2-3-8x7)=7^2x(49-3-56)=49x(-10)=-490(x+y)^2-2(x^2-y^2)+(x-y)^2=(x+y)^2-2(x+y)

3/8=15/40(3/5)/(3/7)=(4/5)/(4/7)

0.9x-4X1.3=1.10.9x-5.2=1.10.9x=1.1+5.20.9x=6.3x=71.3X7=25.1-8x9.1=25.1-8x8x=25.1-9.18x=16x=24.8+0.5x

（4.5-x）X7=17.

4.5-X=17.5/74.5-x=2.54.5-2.5=x答：x=2

4分之1x+4x7=241/4x=24-281/4x=-4x=-16如果本题有什么不明白可以追问,

0.9x--4x1.3=1.10.9x-5.2=1.10.9x=6.3x=71.3x7=25.1-8x9.1=25.1-8x8x=16x=24.8+0.5x=6.30.5x=1.5x=3（25+2x）

48-x+3x7=36 解方程

48-X+3x7=3648-x+21=36-x=36-48-21-x=-33x=33