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解方程:x/(x%2)+(x%9)/(x%7)=(x+1)/(x%1...

解: x/(x-2)+(x-9)/(x-7)=(x+1)/(x-1)+(x-8)/(x-6) 因为x/x-2=(x-2+2)/x-2=1+2/x-2.其他类似。 即 1+2/(x-2)+1-2/(x-7)=1+2/(x-1)+1-2/(x-6) 1/(x-2)-1/(x-7)=1/(x-1)-1/(x-6) 可得-5/(x-2)(x-7)=-5/(x-1)(x-6) (x-2)(x-7)=(x-1)(x-6) 化简...

解: x/(x-2)+(x-9)/(x-7)=(x+1)/(x-1)+(x-8)/(x-6) 1+2/(x-2)+1-2/(x-7)=1+2/(x-1)+1-2/(x-6) 1/(x-2)-1/(x-7)=1/(x-1)-1/(x-6) 1/(x-2)+1/(x-6)=1/(x-1)+1/(x-7) (2x-8)/(x^2-8x+12)=(2x-8)/(x^2-8x+7) 由于x^2-8x+12不等于x^2-8x+7 因此,只...

(1)2(x+1.7)=9.2, 2(x+1.7)=9.2÷2, x+1.7=4.6,x+1.7-1.7=4.6-1.7x=2.9;(2)8x-4x=0.64, 4x=0.64,, 4x÷4=0.64÷4,x=0.16; (3)2x-0.24=0.12,2x-0.24+0.24=0.24+0.12, 2x=0.36, 2x÷2=0.36÷2x=0.18;(4)6.2x-x=416, 5.2x=41...

1+1/7(x-1)=2+1/7{x-[1+1/7(x-1)]-2}, 两边乘以7,得到7+x-1=14+x-1-1/7(x-1)-2, 1/7(x-1)=5, x-1=35, x=36

x/(x-2)+(x-9)/(x-7)=(x+1)/(x-1)+(x-8)/(x-6) (x-2+2)/(x-2)+(x-7-2)/(x-7)=(x-1+2)/(x-1)+(x-6-2)/(x-6) 1+2/(x-2)+1-2/(x-7)=1+2/(x-1)+1-2/(x-6) 1/(x-2)+1-1/(x-7)=1/(x-1)-1/(x-6) [x-7-(x-2)]/[(x-1)(x-2)]=[x-6-(x-1)][(x-6)(x-7)] -5/[...

9(x+0.2)=7.2 x+0.2=7.2÷9 x+0.2=0.8 x=0.8-0.2 x=0.6

2(x➕1)➕7=15 解 2x➕2➕7=15 2x=15➖7➖2 2x=6 x=3

(x+1)(x+9)(x+3)(x+8)+(x+8)(x+2)(x+3)(x+8)=(x+2)(x+2)(x+8)(x+9)+(x+7)(x+2)(x+9)(x+3) 合并同类项 (x+1)(x+9)(x+3)(x+8)-(x+2)(x+2)(x+8)(x+9)=-(x+8)(x+2)(x+3)(x+8)+(x+7)(x+2)(x+9)(x+3) (x+9)(x+8)=(x+2)(x+3) 12x=66 x=11/2

1) 设x/(x+1)=y 则原式为 y+4/y=4 (把4提取出来) 两边同乘以y ,则得到 y^2+4=4y 所以y^2-4y+4=0 解得y=2 所以x/(x+1)=2, 解得x=-2 2)由裂项法,(x+7)/(x+6)=1+1/(x+6) 可得 原式为 1+1/(x+6)+1+1/(x+8)=1+1/(x+9)+1+1/(x+5) 所以有 1/(x...

当然可以的,可以的,还可以按跑步机和乒乓球台来活动。可以的,还可以做其他活动。可以做仰卧起做温度不要开得太低,是可以做的,做完后如果出汗的话注意不要减少衣服!

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