1+2+3`````+9=(1+9)*9/2=45 155/5+12-6=31+6=37 155/3X2+60/4=62+15=77 50/5X60/3=10*20=200
1+2+3`````+9=.155/5+12-6=.155/3X2+60/4=.50/5X60/3=.
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相关问题
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x/3=6/1 7/12x+1/4x=9/20 x/50-3=x/60+2
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1/55+2/55+3/55+.+10/155-11/155-12/155-.-20/155=?
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(1)x+20%x=3.6(2)[1/4]x+3=5.4(3)(1-25%)x=1.5(4)60%x-9=9.6.
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解方程:2(3-y)=5-4(y+5) (2x+1)/6+(x-1)/3=1 60%x-(x+3)*50%=3
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2/5:x=4/5:60 0.2/6.3=X/5 0.6:x=15:1 12:14=X :1/6
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如下题1/55+2/55+3/55+……+10/55-11/155-12/155-13/155-……-20/155
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计算 1/55+2/55+3/55+.+10/55-11/155-12/155-.-20/155
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(60分)3×5+2x=272.5x+1.5=18.51.2x-0.9=0.87(x+4.4)×12=60
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巧计算 1/55+2/55+3/55+.+10/55-11/155-12/155-13/155-...-20/155 怎
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(1) 1/55+2/55+……+9/55+10/55-11/155-12/155-……-19/155-20/155