23 - 10 + 12 =
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- ( 12 + 21 - 23 ) - ( 23 - 21 + 10 )
= (- 10) - 12
= -22
a) 17 + 23 = 40; 23 + 17 = 40
=> 17 + 23 = 23 + 17
b) (12 + 28) + 10 = 40 + 10 = 50
12 + (28 + 10) = 12 + 38 = 50
=> (12 + 28) + 10 = 12 + (28 + 10)
c) 17.23 = 391; 23.17 = 391
=> 17.23 = 23.17
d) (5.6).3 = 30.3 = 90; 5.(6.3) = 5. 18 = 90
e) 23.(43+17) = 23. 60 = 1380
23.43 + 23.17 = 989 + 391 = 1380
=> 23.(43+17) = 23.43 + 23.17
a. (15+37)+(52-37-17) = 15+37+52-37-17
= 15+(37-37)+52-17
= 15+0+35
= 50
= -11/23.-10/13+-11/23.-3/13-(-12/23)
= -11/23.(-10/13+-3/13)-(-12/23)
= -11/23. -1 -(-12/23)
= 11/23- (-12/23)
= -1/23
Ta có: \(A=\dfrac{-11}{23}\cdot\dfrac{-10}{13}+\dfrac{-11}{13}\cdot\dfrac{-3}{23}-\left(-\dfrac{12}{23}\right)\)
\(=\dfrac{11}{13}\left(\dfrac{10}{23}+\dfrac{3}{23}\right)+\dfrac{12}{23}\)
\(=\dfrac{11}{23}\cdot\dfrac{13}{13}+\dfrac{12}{23}\)
\(=\dfrac{-1}{23}\)
=\(\frac{-11}{23}\)\(\times\)\(\frac{10}{-13}\)\(+\)\(\frac{11}{-13}\)\(\times\)\(\frac{-3}{23}\)\(+\)\(\frac{12}{23}\)
=\(\frac{110}{299}\)\(+\)\(\frac{33}{299}\)\(+\)\(\frac{12}{23}\)
=\(\frac{143}{299}\)\(+\)\(\frac{12}{23}\)
= 1
8 - ( x - 10 ) = 23 - ( -4 + 12 )
8 - x + 10 = 23 - 8
( 10 + 8 ) - x = 15
18 - x = 15
x = 18 - 15 = 3
8 - ( x -10 ) = 23 - ( -4 + 12 )
8 - x + 10 = 23 + 4 - 12
8 - x + 10 = 15
8 - x = 5
x = 3
8-(x-10)= 23 -(-4+12)
8-x+10=23+4-12
8 - x + 10 = 15
8 - x = 15 - 10 = 5
=> x = 8 - 5
x = 3
Vậy x = 3
\(25.23\left[164-\left(12-4\right)2\right]+10\\ =25.23\left[164-8.2\right]+10\\ =25.23\left[164-16\right]+10\\ =25.23.148+10\\ =85110\)
TOÁN LỚP 1 THÌ CÓ
=1NHÉ
23 - 10 +12
= 13 + 12
= 25