Câu hỏi của hoaithu truong

Question

Tìm x, biết: (x+9)+(x-2)+(x+7)+(x-4)+(x+5)+(x-6)+(x+3)+(x-8)+(x+1)=95

YangSu · Accepted Answer

$\left(x+9\right)+\left(x-2\right)+\left(x+7\right)+\left(x-4\right)+\left(x+5\right)+\left(x-6\right)+\left(x+3\right)+\left(x-8\right)+\left(x+1\right)=95$$x+9+x-2+x+7+x-4+x+5+x-6+x+3+x-8+x+1=95$$\left(x\times9\right)+\left(9-2+7-4+5-6+3-8+1\right)=95$$x\times9+5=95$$x\times9=95-5$$x\times9=90$$x=90:9$$x=10$Câu trả lời: $\left(x+9\right)+\left(x-2\right)+\left(x+7\right)+\left(x-4\right)+\left(x+5\right)+\left(x-6\right)+\left(x+3\right)+\left(x-8\right)+\left(x+1\right)=95$$x+9+x-2+x+7+x-4+x+5+x-6+x+3+x-8+x+1=95$$\left(x\times9\right)+\left(9-2+7-4+5-6+3-8+1\right)=95$$x\times9+5=95$$x\times9=95-5$$x\times9=90$$x=90:9$$x=10$

Kiều Vũ Linh · Answer

(x + 9) + (x - 2) + (x + 7) + (x - 4) + (x + 5) + (x - 6) + (x + 3) + (x - 8) + (x + 1) = 95x + 9 + x - 2 + x + 7 + x - 4 + x + 5 + x - 6 + x + 3 + x - 8 + x + 1(x + x + x + x + x + x + x + x + x) + (9 - 8 + 7 - 6 + 5 - 4 + 3 - 2 + 1) = 959 × x + 5 = 959 × x = 95 - 59 × x = 90x = 90 : 9x = 10Câu trả lời: (x + 9) + (x - 2) + (x + 7) + (x - 4) + (x + 5) + (x - 6) + (x + 3) + (x - 8) + (x + 1) = 95x + 9 + x - 2 + x + 7 + x - 4 + x + 5 + x - 6 + x + 3 + x - 8 + x + 1(x + x + x + x + x + x + x + x + x) + (9 - 8 + 7 - 6 + 5 - 4 + 3 - 2 + 1) = 959 × x + 5 = 959 × x = 95 - 59 × x = 90x = 90 : 9x = 10

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