tính nhanh 1,24 ^ 2 -2,48*0,24+0,24 ^ 2
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1,24x^2-2,48.0,24+0,24\)
\(\Leftrightarrow1,24x^2-2.2,48.0,24+0,24^2\)
\(\Leftrightarrow1,24x^2-1,2+0,1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1.24 x 1.24 - 0.24 x 0.24
Đúng nhé , tk nhé , mơn nhìu !!!
~ HOK TỐT ~
Ta có :
\(1,24^2-0,24^2=\left(1,24+0,24\right).\left(1,24-0,24\right)\)
~
![](https://rs.olm.vn/images/avt/0.png?1311)
Đề là gì bạn nhỉ?
\(16-\left(x-3\right)^2=4^2-\left(x-3\right)^2=\left(4-x-3\right)\left(4+x-3\right)\)
\(64+16y+y^2=y^2+2y4+4^2=\left(y+4\right)^2\)
\(1,24^2-0,24^2=\left(1,24-0,24\right)\left(1,24+0,24\right)=1.1,48=1,48\)
\(\frac{1}{8}-8x^3=\left(\frac{1}{2}\right)^3-\left(2x\right)^3=\left(\frac{1}{2}-2x\right)\left(\frac{1}{4}+x+4x^2\right)\)
\(100-\left(3x-y\right)^2=10^2-\left(3x-y\right)=\left(10-3x+y\right)\left(10+3x-y\right)\)
\(64x^2-\left(8x+3\right)^2\)
\(=\left(8x\right)^2-\left(8x+3\right)^2\)
\(=\left(8x-8x-3\right)\left(8x+8x+3\right)\)
\(=\left(-3\right)\left(16x+3\right)\)
\(=-48x-9\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(205^2-95^2=\)
\(=\left(205-95\right)\left(205+95\right)\)
\(=200.300\)
\(=60000\)
\(36^2-14^2=\)
\(=\left(36-14\right)\left(36+14\right)\)
\(=22.50\)
\(=1100\)
\(205^2-95^2=\left(205-95\right)\left(205+95\right)=110.300=33000\)
\(36^2-14^2=\left(36-14\right)\left(36+14\right)=22.50=1100\)
\(97^2-3^2=\left(97-3\right)\left(97+3\right)=94.100=9400\)
\(1,24^2-2,48\times0,24+0,24^2\)
\(=1,24-2\times1,24\times0,24+0,24^2\)
\(=\left(1,24-0,24\right)^2\)
\(=1\)