(X 30)×(X-18)=X×X-搜答案-搜狗做题网

10PRINT“ENTERX”:输出"ENTERX"字符串20INPUTX:输入X的值30Y=1/7X+3:计算Y等于七分之一X再加上3(这里7X中间要加个*号,不然会出错)40PRINT“Y=”：Y

(1)6a+13a=(6+13a)=19a(2)6x-28-2.5x30.5=6x-28-76.25=6x-104.25(3)8a-(5a+8)=8a-5a-8=3a-8(4)(5x+7)-(4x+0

3x-18=13.23x=13.2+18x=10.41.5x-x=60.5x=6x=6/0.5=124x+1.2x=265.2x=26x=5

原式:X^2-5X+6+18=X^2+10X+9-5X+24=10X+915X=15X=1

(X-X*20%-18)-（X-X*20%-18）*10%=X*1/2-3则（X*80%-18）*90%=X*1/2-372%*X-16.2=X*1/2-322%*X=13.2X=60

1/x（x+3)+1/（x+3)(x+6)+1/（x+6)(x+9）=3/2（x+9)（1/3）×[3/x（x+3)+3/（x+3)(x+6）+3/（x+6）（x+9)]=3/2（x+9）（1/3)[

（X+X)+(X-X)+(X*X)+(X/X)=1002X+0+X*X+1=1002X+X*X=99X(X+2)=99X=9再问：请问X(X+2)=99解为什么就等于9了呢没看懂再答：换成算术法你就明

25%x+3=3分之2*60.25x+3=40.25x=4-30.25x=1x=1÷0.25x=418-5%x=12.818-0.05x=12.80.05x=18-12.80.05x=5.2x=5.2

x(x-1)=18

x(x-1)=18x-x=18x-x+1/4=18+1/4(x-1/2)=73/4x=1/2±√73/2

x^4-4x^3-4x^2+15x+18=0x^4-3x^3-x^3+3x^2-7x^2+21x-6x+18=0(x-3)(x^3-x^2-7x-6)=0x1=3x2=3.49449283705542

x-0.7x=18

0.3X=18X=60

设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=

1/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=1/3[1/x-1/(x+3)]+[1/(x+3)-1/(x+6)]+.+[1/(x+15)-1/(x+18)

1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=[1/x-1/(x+3)+1/(x+3)-1/(x+6)+1(x+6)-1/(x+9)]/3=[1/x-1/(x+9)]/3=3/

不对30%X-25%X=85或0.3X-0.25X=85

【27.36-9.36÷0.9】=27.36-10.4=16.96【85x0.7+6x85-0.85x30】=85x0.7+6x85-85x0.3=85x（0.7+6+0.3）=85*7=595解方程

delayL(50)是程序暂停等待50毫秒,至于write_zl()就要看看具体代码了

X+5X=18

（5+1）X=186X=18X=3

问题是不是X2=(X+30)*(X-18）啊?要是上面的话就这样X2=X*X-X*18+30*X-30*18=X2+12X-540移项得：X2-X2-12X=-540,即-12X=-540,X=45*

x+x=x+15

2x等于x+15x等于15