作业帮53.5x1.9+61x1.25+41x8.1简算
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53.5x1.9+61x1.25+41x8.1简算
53.5x1.9+61x1.25+41x8.1简算
53.5x1.9+61x1.25+41x8.1简算
53.5x1.9+61x1.25+41x8.1 =53.5x（2-0.1）+（60+1）x1.25+（40+1）x8.1 =53.5x2-53.5x0.1+60x1.25+1x1.25+40x8.1+1x8.1=107-5.35+75+1.25+324+8.1=(107+75+324)+(1.25-5.35+8.1)=506+4=510
53.5x1.9+61x1.25+41x8.1简算
41.2X8.1+11X1.25+53.7X1.9
41.2x8.1+11x1.25+53.7x1.9
41.8x8.1+11x1.25+53.7x1.9=?
（-8/25)x1.25x(-8) 计算
(-8/25)x1.25x(-8)计算
8+(x-4)x1.7=25
2.5X1.6X1.25简算
(1/2005x1/2004x1/2003x...x1/3x1/2x1)^2005x(2005x2004x2003x...x3x2x1)^2005
疑难数学问题火急求助x1^3-3x1^2+2x1+x2→x1（x1^2-2x1+2-x1）+x2→x1（3-x1）+x2 (怎么算出3-X1的)→3x1-x1^2+x2=2x1-x^2+x1+x2=-(x^2-2x1)+x1+x2=-1+2=1
2x1-x x+2
y=|x-x1|+|x-x2|+ +|x-xn|(x1
2.5x1.25x3.
3x1/4十4x1/5十5X1/6十6X1/7十7X1/8十8X1/9十9x1/10=
求几道一元二次方程的过程(11)x^2+15x-54=0 x1=-18 x2=3 (12)x^2+11x+18=0 x1=-2 x2=-9 (13)x^2-9x+20=0 x1=4 x2=5 (14)x^2+19x+90=0 x1=-10 x2=-9 (15)x^2-25x+156=0 x1=13 x2=12 (16)x^2-22x+57=0 x1=3 x2=19 (17)x^2-5x-176=0 x1=16 x2=-11 (18)x^2-26x+
0.8X(2.3-1.17)X1.25X(3.27+0.73)
(x 16)X1/4=9/20x
1+(x-9-1)x1/10=2+[x-9-1-(x-9-1)x1/10-2]x1/10怎么算