1.4*2.5-0.2x=1.

1.4*2.5-0.2x=1. 19.8x+0.2x=2.5×2 21分之10x÷3分之2=7分之3x-3分之1x-2分之1x=190x-53x=7408.5x-6.9x=43.3x-200=0.2x+1101.02+0.4x+2.6x=3.428.9x-67=4.5x+656x-58=3x+1410x-20=5x+806x+5=10x-3420-1.4x=9.8x-288.2x+5.4x=272 (1) 2.5+3X=1.1 (2) 12X-5X=2.1 (3) X-0.3X=1.4 X=1.1 X=2.1 X=1.4 X=?X=0.3 X=? 1.X(X+5) - 1 = 203 2.5X(X+1) - 5 = 203怎么解? 3.2+x=4.6 x-2.08=5.76 1.2x=0.84 3x+0.5x=4.2 4x-2.16=1.2 x-0.2x=16 2x-4*2.5=3.6 x除以5.4=0.26 3x+0.5x=4.2 4x-2.16=1.2 x-0.2x=16 2x-4x[这个x是乘】2.5=3.6 3x+5x=168 怎么解 解方程:(一共2道) 1.x-2/x+2-16/x-4=1 2.5/x+x-1/x-x=0 帮我解决些数学题 判断下列函数的奇偶性 1.f(x)=1/2x.2.f(x)=-2x+5.3.f(x)=x^4+x^2-1.4.f(x)=2x^3-x 1.4x-x=9.8求x x+(x-1.4)+1.5x=33. 1.x/0.3+8/3-1.4-3x/0.2=14 2.0.1x+4/0.5+0.1x+2/0.2=10 1.x-y=7,3x+5y=-3 2.5- x/x-1=3/x-1 x-30-0.2x=0.5x x-0.2x=80 求x x+x-2.5+x-4=85 1.用公式计算：COSX=1-X*X/2!X*X*X*X/4!-X*X*X*X*X*X/6!.直到最后一项的绝对 2+X=1.4X