Câu hỏi của midoriya izuku

Question

tìm số tự nhiên x biết:a. 326 - 2x = 78b. 42 . 5 - (3x + 6) = 34c. 4x : 64 = 4250d. (x + 1) + (x + 2) + (x + 3) +...+ (x + 29) + (x + 30) = 495

Vũ Cao Minh⁀ᶦᵈᵒᶫ ( ✎﹏IDΣΛ亗 ) · Accepted Answer

a) $326-2x=78\Rightarrow2x=326-78=248$$\Rightarrow x=248:2=124$b) $42.5-\left(3x+6\right)=3^4\Rightarrow210-\left(3x+6\right)=81$$\Rightarrow3x+6=210-81=129\Rightarrow3x=129-6=123$$\Rightarrow x=123:3=41$Câu trả lời: a) $326-2x=78\Rightarrow2x=326-78=248$$\Rightarrow x=248:2=124$b) $42.5-\left(3x+6\right)=3^4\Rightarrow210-\left(3x+6\right)=81$$\Rightarrow3x+6=210-81=129\Rightarrow3x=129-6=123$$\Rightarrow x=123:3=41$

Trần Đình Tuệ · Answer

a, 326 -2x =78$\Rightarrow$2x=326-78=248$\Rightarrow$x=248/2=124b,$42.5-\left(3x+6\right)=3^4$$\Rightarrow$$210-3x-6=81$$\Rightarrow$3x=123$\Rightarrow$x=123/3=41c, $4^x:64=4^{250}$$\Rightarrow$$4^x:4^3=4^{250}$$\Rightarrow$x=253d, $30x+1+2+3+...+30=495$$\Rightarrow$$30x+465=495$$\Rightarrow$$x=1$Câu trả lời: a, 326 -2x =78$\Rightarrow$2x=326-78=248$\Rightarrow$x=248/2=124b,$42.5-\left(3x+6\right)=3^4$$\Rightarrow$$210-3x-6=81$$\Rightarrow$3x=123$\Rightarrow$x=123/3=41c, $4^x:64=4^{250}$$\Rightarrow$$4^x:4^3=4^{250}$$\Rightarrow$x=253d, $30x+1+2+3+...+30=495$$\Rightarrow$$30x+465=495$$\Rightarrow$$x=1$

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