(180 x-20)(50-10X)=10890解一下
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X+1-3X=5X+105x+3x-x=-10+17x=-9x=-9/76-3X=5X-205x+3x=20+68x=26x=13/4一、已知M-N=3,则9-2M+2N==9-2(M-N)=9-6=
2x+4(x-12)=602x+4x-48=602x+4x=48+606x=108x=108÷6x=184x-2(50-x)=204x-100+2x=204x+2x=100+206x=120x=120
180-x=2(90-x)+20180-x=180-2x+20x=20再问:具体过程再答:首先打开括号180-x=180-2x+20左右两边都加2x-180变为:x=20
(X-X*20%-18)-(X-X*20%-18)*10%=X*1/2-3则(X*80%-18)*90%=X*1/2-372%*X-16.2=X*1/2-322%*X=13.2X=60
8x-(50-x)*3=1808x-(150-3x)=1808x-150+3x=18011x=330x=30
xx是什么如果是x的平方,x=10倍根号2
X-(0.2X+0.2X+50)=70X-0.4X-50=700.6X=120X=200
X+30%X=52(1+30%)x=521.3x=52x=52÷1.3x=40X-10%x=27(1-10%)x=270.9x=27x=27÷0.9x=3020%x+24=4020%x=40-240.
3x+30=1803x=150x=50
40%x=120.4X=120.4/0.4X=12/0.4X=30(1+60%)x=241.6X=24X=151-37.5%)x=10X=15.752x+50%x=202.5X=20X=840%x+3
30-3(3-X)=4X30-9+3x=4x21=xx=213X+12*6=15X+1272-12=15x-3x12x=60x=54X-2(50-X)=204x-100+2x=206x=120x=20
6%x+19%x=22.525%x=22.5x=22.5÷0.25x=9078%x-117=3978%x=39+1170.78x=156x=200400-50%x=18050%x=400-1800.5
你是不是题目不全啊,如果是式子要简化的话就下面的y=(180+x-20)(50-x/10)y=(160+x)(50-x/10)y=8000+34x-x^2/10
再问:谢谢咯亲,不用啦
1.5X+20=1X(50-X)1,5x+20=50-x1.5x+2=50-202.5x=30x=12
第一题,因x→∞,所以:可看成,(2X)^10*(x)^50]/(x^60)=2第二题,因x→+∞,所以:可看成,(√2x√x)/(√x)=√2x
20%x+[25*20%x]+12=50%x+20.2x+5x+12=0.5x+24,7x=-10x=-100/47
8x-4(10-x)=448x-40+4x)=4412x=84x=760x+(100-x)*65=100*6360x+6500-65x=63005x=200x=4030x-20(180-x)=5250
10*20%=3X-0.1X2.9X=2X=0.69
130%x+x=4.61.3x+x=4.62.3x=4.6x=2x÷50%=10x=10乘2x=20x/9-x/15=16%x(1/9-1/15)=16/100x(5/45-3/45)=4/25x=4