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`687 + (2 × 5) + 10`
`= 687 + 10 + 10`
`= 697 + 10`
`= 707`
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Đáp án đúng là:
(600 + 30) + 5 = 600 + (30 + 5)
(600 x30) x 5 = 600 x ( 30 x 5)
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x + 200 = 600 + 400 : 2 + 5
x + 200 = 600 + 200 + 5
x + 200= 800 + 5
x + 200 = 805
x= 805 - 200
x = 605
x - 200 = 600
x= 600 + 200
x= 800
x+200=600+400:2+5
x+200=600+200+5
x+200=800+5
x+200=805
x=805-200
x=605
x-200=600
x=600+200
x=800
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) 2 x 6 = 12 3 x 7 = 21
12 : 2 = 6 21 : 3 = 7
12 : 6 = 2 21 : 7 = 3
4 x 8 = 32 5 x 9 = 45
32 : 4 = 8 45 : 5 = 9
32 : 8 = 4 45 : 9 = 5
b) 600 : 3 = 200 800 : 4 = 200 400 : 2 = 200
600 : 2 = 300 800 : 2 = 400 500 : 5 = 100
a) 2x6=12 3x7=21
12:2=6 21:3=7
12:6=2 21:7=3
4x8=32 5x9=45
32:4=8 45:5=9
32:8=4 45:9=5
b) 600:3=200 800:4=200 400:2=200
600:2=300 800:2=400 500:5=100
A Legend Never Dies
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\(5^x-5^{x-2}=600\)
\(5^x-5^x:5^2=600\)
\(5^x-5^x:25=600\)
\(5^x-5^x\cdot\frac{1}{25}=600\)
\(5^x\left(1-\frac{1}{25}\right)=600\)
\(5^x\cdot\frac{24}{25}=600\)
\(5^x=625\Rightarrow5^x=5^4\)
\(\Rightarrow x=4\)
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tương đương 5^x:25-5^x=600
tương đương 5^x:(25-1)=600
tương đương 5^x=600:24
tương đương 5^x=25
tương đương 5^x=5^2
tương đương x=2
vậy x=2
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\(5^x+2-5^x=600\)
\(\left(5^x-5^x\right)+2=600\)
\(0+2=600\)
\(2=600\left(\text{có j đó sai sai}\right)\)
600 : 2 x 5
= 300 x 5
= 1 500
~HT~
600 : 2 × 5
= 300 × 5
= 1500