[ 15 -5 x] mũ 4 = 625
giúp mik vs ạ
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10³ + 2¹⁵
= 1000 + 32768
= 33768
Mà 33768 : 33 = 1023 (dư 9)
Em xem lại đề
\(2^{x+1}-2^x=3^2\)
\(\Rightarrow2^x\cdot\left(2-1\right)=9\)
\(\Rightarrow2^x=9\)
\(\Rightarrow x\in\varnothing\)
\(2^{x+1}-2^x=3^2\)
=>2^x*2-2^x=9
=>2^x=9
=>\(x\in\varnothing\)
\(\dfrac{15\left(x-y\right)^5-9\left(x-y\right)^4+12\left(x-y\right)^2}{\left(x-y\right)^2}\)
\(=15\left(x-y\right)^3-9\left(x-y\right)^2+12\)
`@` `\text {Ans}`
`\downarrow`
`(2^2+1) \times (x+14) = 5^2 \times 4 + (2^5 + 3^2 + 7^2) \div 2`
` \Rightarrow (4+1) \times (x+14) = 5^2\times 2^2 + ( 32 + 9 + 49) \div 2`
`\Rightarrow 5 \times (x+14) = (5*2)^2 + (32+58) \div 2`
`\Rightarrow 5 \times (x+14) = 10^2+90 \div 2`
`\Rightarrow 5 \times (x+14) = 100 + 45`
`\Rightarrow 5 \times (x+14) = 145`
`\Rightarrow x+14 = 145 \div 5`
`\Rightarrow x+14=29`
`\Rightarrow x=29-14`
`\Rightarrow x=15`
Vậy, `x=15.`
\(\left(2^2+1\right)\cdot\left(x+14\right)=5^2\cdot4+\left(2^5+3^2+7^2\right):2\)
\(\Rightarrow\left(4+1\right)\cdot\left(x+14\right)=25\cdot4+\left(32+9+49\right):2\)
\(\Rightarrow5\cdot\left(x+14\right)=100+45\)
\(\Rightarrow5x+70=145\)
\(\Rightarrow5x=75\)
\(\Rightarrow x=\dfrac{75}{5}=15\)
a)x*4/5:2=6/7 b)6/5:x:5/4=10/15
x*4/5=6/7 x 2 6/5:x=10/15 x 5/4
x*4/5=12/7 6/5:x=5/6
x=12/7:4/5 x=6/5:5/6
x=15/7 x=36/25
a) x * 4/5 : 2 = 6/7
x * 4/5 = 6/7 *2
x *4/5 = 12/7
x = 12/7 : 4/5
x = 15/7
Vậy x = 15/7
Trả lời :
56 : 54 + 23 . 22 - 225 : 152
= 56 - 4 + 23 + 2 - 152 : 152
= 52 + 25 - 1
= 25 + 32 - 1
= 56
\(\left[15-5x\right]^4=625\)
\(\Rightarrow\)\(\left[15-5x\right]^4=5^4\)
\(\Rightarrow\)\(15-5x=5\)
\(\Rightarrow\)\(5x=15-5\)
\(\Rightarrow\)\(5x=10\)
\(\Rightarrow\)\(x=5\)