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12 x 1 + 12 x 2 + 12 x 3 + 12 x 4
= 12 x (1 + 2 + 3 + 4)
= 12 x 10
= 120
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( 123 . 456 - 23 . 16 ) . ( 12 . 9 - 4 . 27)
= ( 56088 - 368) . ( 108 - 108 )
= 55720 . 0
= 0
( 123 x 456 - 23 x 16 ) x ( 12 x 9 -4 x 27 )
=( 123 x 456 - 23 x 16 ) x (108 -108)
=( 123 x 456 - 23 x 16 ) x 0=0
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( 123 * 456 - 23 * 46) * (12 * 9 - 4 * 27) = 55030 * 0
= 0.
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1) Tính:
1243 x 23 + 12 : 2 = 28589 + 6 =28595
23 x 786 : 3 x 12 = 18078 : 3 x 12 = 6026 x 12 = 72312
2) Tính nhanh:
12 x 4 + 23 x 2 x 2 = 12 x 4 + 23 x 4 = ( 12 + 23 ) x 4 = 35 x 4 = 140
9 x 19 + 3 x 19 - 2 x 19 = ( 9 + 3 - 2 ) x 19 = 10 x 19 = 190
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\(\Leftrightarrow\left(x^2-12x-6\right)\left(x^2-4x+2\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x^2-12x-6=0\\x^2-4x+2=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}\left(x-6\right)^2=42\\\left(x-2\right)^2=2\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x-6\in\left\{\sqrt{42};-\sqrt{42}\right\}\\x-2\in\left\{\sqrt{2};-\sqrt{2}\right\}\end{matrix}\right.\Leftrightarrow x\in\left\{\sqrt{42}+6;-\sqrt{42}+6;\sqrt{2}+2;2-\sqrt{2}\right\}\)
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X - \(\frac{5}{12}\) = \(\frac{2}{3}\) - \(\frac{1}{4}\)
X - \(\frac{5}{12}\) = \(\frac{5}{12}\)
X = \(\frac{5}{12}\) + \(\frac{5}{12}\)
X = \(\frac{10}{12}\) = \(\frac{5}{6}\) TK MÌNH NHÉ BẠN
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12*12*12*12*12= 125 =248832
4*4*4*4*4*4*4*4*4=48 =65536
(bài này lớp 6 nha bạn)
12*12*12*12*12 = 125 = 248832
4*4*4*4*4*4*4*4 = 48= 65536
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4 x 12 = 48 nha bạn
Ủng hộ mik nha
=148 chu may