2.7x-1.3x=0.3
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2.4x=4.8x=2
5x=6.5,x=1.3,3x=3.9
(1)6x=42x=71.3x+2.7x=4x=4*7=28(2)34+15*(7)=1395*【(46)-27】=95(3)x+x=x*x,x=(0或2)
1.3x+2.x=4x6x=42所以x=7所以结果为4*7=28
1、(0.3+x)*2=80.6+2x=82x=7.4x=3.72、7+5x=425x=35x=73、1.3x-x=18.60.3x=18.6x=62
0.3x-0.5×0.6=2.70.3x-0.3=2.70.3x=2.7+0.30.3x=3x=3÷0.3x=10
(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
x+3.5x=9.94.5x=9.9x=2.24.25x-x=4.553.25x=4.55x=1.410x-2.7x=58.47.3x=58.4x=86.8x+3.2x=10010x=100x=10
(1)3X+3=XX=-3/2(2)1/3a-5=2aa=-3(3)设乙数为X21-X=2XX=7(乙)2X=14(甲)(4)设某数为X3x-2=x+4x=3(5)把a=3,x=-1代入b=-3所以3
(1.8-8x)/1.2-(1.3-3x)/2-(5x-0.4)/0.3=0(18-80x/12-(1.3-3x)/2-(50x-4)/3=01.5-20/3x-0.65+3/2x-5
160*25%-1.3x=17.91.3x=40-17.9x=22.1/1.3x=17再问:x/5-x/6=0.43(x+2)=40+110.3/0.5=x+1/2x-12.5/(x—0.5)=25%
4(x+0.3)=4.8x+0.3=1.2x=1.2-0.3x=0.93*0.7+4x=6.52.1+4x=6.54x=6.5-2.14x=4.4x=1.15.5x-1.3x=12.64.2x=12.
5X+0.3=7X-1.30.3+1.3=7X-5X2.6=2XX=1.3
(0.3+x)*2=80.3+x=8÷20.3+x=4x=4-0.3x=3.77+5x=425x=42-75x=35x=35÷5x=71.3x-x=18.60.3x=18.6x=18.6÷0.3x=6
1.8-8x/1.2-1.3-3x/2=5x-0.4/0.31/2-20x/3-3x/2=5x-4/311/6=79x/6x=11/79
#includesintjiesheng(intn)//用于计算阶乘如:3!{if(n=1)rerunn;returnn*hh(n-1)}doubledigui(intn,intx)//用以计算y=x
2x等于x+15x等于15
组?0.3x+1.2-2x=1.2-2.7x0.3x-2x+2.7x=1.2-1.2x=0