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25x3.14等于多少

中间那点是神马意思? 25*3=75 14那道题是7

-75×(-3.14)+(-25)×(-314)+25×3.14 =75x3.14+2500x3.14+25x3.14 =(75+2500+25)x3.14 =2600x3.14 =8164

3.925

3.14x7.25+3.14x1.75+3.14 =3.14x(7.25+1.75+1) =3.14x10 =31.4

3.14x(125.6÷2÷3.14x3.14) =3.14x(4x3.14) =3.14x125.6 =39.4384

4个截面

3.14/2x=25.7 1.57x=25.7 x=2570/157

利用公式 x=(-b+/-根号下(b的平方-4ac))/2a 即a=3.14,b=-10,c= -25,自己算一下就可以了

宽 8-5=3厘米 面积 8x8x3.14-5x5x3.14 =64x3.14-25x3.14 =39x3.14 =122.46平方厘米

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