-307x(-4 1) 0.25x24.5 (-11)x(-2590)怎么简便

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-307x(-4 1) 0.25x24.5 (-11)x(-2590)怎么简便
0.25 x 7.5 x 0.5简便算法

0.25x7.5x0.5=0.125x7.5=0.125x(8-0.5)=0.125x8-0.125x0.5=1-0.0625=0.9375

0.25 x 7.9 x 0.5简便算法

0.25*7.9*0.5=0.25x0.5x(8-0.1)=0.25x0.5x8-0.25x0.5x0.1=0.125x8-0.125x0.1=1-0.0125=9.9875

16+0.2x=0.25x十9求x!

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展开式的通项为Tr+1=(−12)rCr10x30−5r令30-5r=0得r=6故展开式的常数项为(−12)6C610=10532故答案为10532

0.35x+0.25×(32-X)=10.

0.35x+0.25×(32-X)=10.40.35x+8-0.25x=10.40.35x-0.25x=10.4-80.1x=2.4x=2.4÷0.1x=24

0.3x-x*0.25=21.15-7x

0.3x-x×0.25=21.15-7x0.3x-0.25x=21.15-7x0.5x=21.15-7x0.5x+7x=21.157.5x=21.15x=21.15÷7.5x=2.82这里涉及到“两边

0.3x+7x-0.25x+=21.15

(0.3+7-0.25)x=21.157.05x=21.15x=21.15/7.05=3

(X+X)+(X-X)+(X*X)+(X/X)=100

(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

0.3x-x乘以0.25=21.15-7x

0.3x-x乘以0.25=21.15-7x0.05x+7x=21.157.05x=21.15x=3

8(10-x)-5x=41

“李龙参加数学竞赛,共有10题,每做对一题加8分,错一题或不做倒扣5分,李龙最后得分41分,他做错了几道题”做错x题,共10题,做对10-x题,做对1题8分,做对题得分=8×(10-x)做错1题扣5分

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x-0.25=0.25x

x-0.25=0.25x化为x-0.25x=0.25即0.75x.=0.25所以x=0.25/0.75=1/3=0.333333

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解方程:x^0.75-x^0.25=0.75 求x

方程是啥?如果为:x^0.75-x^0.25=0.75令t=x^0.25,则x^0.75=t^3方程化为:t^3-t=0.75,解得:t=1.26255112740716x=t^4=2.5409486

解方程 0.3x+7x-0.25x=21.25

0.3x+7x-0.25x=21.257.05x=21.25705x=2125x=425/141

0.3x+7x-0.25x=21.15

0.3x+7x-0.25x=7.05x7.05x=21.15x=3

10x-3.14*x*x*0.25=3.14*x*x*0.75 怎么算

10x-3.14*x*x*0.25=3.14*x*x*0.7510x=3.14*x*x*0.75+3.14*x*x*0.253.14*x*x*(0.75+0.25)-10x=03.14*x*x-10x

0.3x+7x-0.25x=21.5

(1)0.3x+7x-0.25x=21.5(0.3+7-0.25)x=21.57.05x=21.5x=141/430(2)8.7*(36-x)=031.2-8.7x=031.2=8.7xx=312/8

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解题思路:同学你好,本题利用同角三角函数的基本关系求解,具体过程见解析解题过程: