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36 . 23 + 62 . 23 + 46
= 23 (36 + 62) + 46
= 23 . 98 + 48
= 20 . 90 + 3 . 8 + 48
= 180 + 24 + 48
= 180 +(24 + 48)
= 180 + 72
= 252
\(36\cdot23\cdot62\cdot23+46\)
\(=36\cdot23+62\cdot23+23\cdot2\)
\(=23\left(36+62+2\right)\)
\(23\cdot100=2300\)
a: \(=168:\left[180-\left(36+2^3\cdot8\right)\right]=168:80=\dfrac{21}{10}\)
b: =62-81-12+59-9
=50+50-81
=100-81
=19
c: \(=298\cdot198-298\cdot127+198\cdot127-198\cdot298\)
=127x(-100)=-12700
\(\dfrac{-11}{23}\).\(\dfrac{62}{15}\)+\(\dfrac{8}{5}\).\(\dfrac{-11}{23}\)-\(\dfrac{1}{23}\)
=\(\dfrac{-11}{23}\).\(\left(\dfrac{62}{15}+\dfrac{8}{15}\right)\)-\(\dfrac{1}{23}\)
=\(\dfrac{-11}{23}\).\(\dfrac{14}{3}\)-\(\dfrac{1}{23}\)
=\(\dfrac{-154}{69}\)-\(\dfrac{1}{23}\)
=\(\dfrac{-154}{69}\)-\(\)\(\dfrac{3}{69}\)
=\(\dfrac{-151}{69}\)
Chúc bn hc tốt!
Đề bài là \(\dfrac{8}{5}\) mà bạn có phải \(\dfrac{8}{15}\) đâu
\(23.157+46.15-23.87\)
\(=23.157+23.30-23.87\)
\(=23\left(157+30-87\right)\)
\(=23.100\)
\(=2300\)
Hok tot
23 x 157 + 46 x 15 - 23 x 87
= 23 x 157 + 23 x 30 - 23 x 87
= 23 x ( 157 + 30 - 87 )
= 23 x 100
= 2300
a ) 31 x ( - 125 ) + 225 x 31
= 31 x [ ( - 125 ) + 225 ]
= 31 x 100
= 3100
b ) 26 x ( - 125 ) - 125 x ( - 36 )
= ( - 26 ) x 125 - 125 x ( - 36 )
= 125 x [ ( - 26 ) - ( - 36 ) ]
= 125 x 10
= 1250
a) 31 × (-125) + 225 × 31
= 31 x ( -125 + 225 )
= 31 x 100
= 3100
b) 26 × (-125) – 125 × (-36)
= -125 ( 26 - 36 )
= 125x 10
= 1250
d) 17 × (-37) – 23 × 37 – 46 × (-37)
= -629 - 851 + 1702
= 1480
36 x 23 + 62 x 23 + 46 = 36 x 23 + 62 x 23 + 2 x 23
= 23 x (36 + 62 + 2)
= 23 x 100 = 2300