7.5 x=0.25
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0.25x7.5x0.5=0.125x7.5=0.125x(8-0.5)=0.125x8-0.125x0.5=1-0.0625=0.9375
4x+0.5=7.54x=7.5-0.54x=7x=7÷4x=1.750.25x+3=0.3x0.3x-0.25x=30.05x=3x=3÷0.05x=600.4(x-16)=15.2x-16=15.
2(x-7.5)=1.5x2x-2x7.5=1.5x2x-15=1.5x2x-1.5x=150.5x=15x=30注意:第二行是2乘7.5,不是x
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7.5x-x=526.5x=52x=52÷6.5x=8
0.3x-x×0.25=21.15-7x0.3x-0.25x=21.15-7x0.5x=21.15-7x0.5x+7x=21.157.5x=21.15x=21.15÷7.5x=2.82这里涉及到“两边
(0.3+7-0.25)x=21.157.05x=21.15x=21.15/7.05=3
(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
0.3x-x乘以0.25=21.15-7x0.05x+7x=21.157.05x=21.15x=3
x-0.25=0.25x化为x-0.25x=0.25即0.75x.=0.25所以x=0.25/0.75=1/3=0.333333
x-o.8x=6X=3012x-8x=4.8X=1.23x-8=16X=8x-0.7x=3.6X=127.5x-2x这题没有=
方程是啥?如果为:x^0.75-x^0.25=0.75令t=x^0.25,则x^0.75=t^3方程化为:t^3-t=0.75,解得:t=1.26255112740716x=t^4=2.5409486
x=5\11=0.4545.
解;7.5x-0.5x-2x=1307x-2x=1305x=130x=26
8x+5x=13x3x-2x=x7.5-4.2x=7.5-4.2x(如果是7.5x-4.2x的话就是3.3x)
0.3x+7x-0.25x=21.257.05x=21.25705x=2125x=425/141
0.3x+7x-0.25x=7.05x7.05x=21.15x=3
10x-3.14*x*x*0.25=3.14*x*x*0.7510x=3.14*x*x*0.75+3.14*x*x*0.253.14*x*x*(0.75+0.25)-10x=03.14*x*x-10x
(1)0.3x+7x-0.25x=21.5(0.3+7-0.25)x=21.57.05x=21.5x=141/430(2)8.7*(36-x)=031.2-8.7x=031.2=8.7xx=312/8