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54 x 275 + 825 x 15 + 275
=14850 + 825 x 15 + 275
=14850 + 12375+275
=14850 + 12650
=27500
477x1998-1998x427
=1998x(477-427)
=1998x50
=99900
1985:2+15:2
=(1985+15):2
=2000:2
=1000
40x113x25-20x112x50
=(40x25)x113-(20x50)x112
=1000x113-1000-112
=1000x(113-112)
=1000x1
=1000
câu 1, ??????????????
câu 2, [477-427], +[1998-1998]=50+0=50
câu 3,[1985+15]:2=2000:2=1000
câu 4, ??????????
chú thích ? là ko có cách tính nhanh
k) 4 x 113 x 25 - 5 x 112 x 20
= (4 x 25) x 113 - (5 x 20) x 112
= 100 x 113 - 100 x 112
= 100 x (113 - 112)
= 100
p) 1235 x 6789 x (630 - 315 x 2) : 1996
= 1235 x 6789 x (630 - 630) : 1996
= 1235 x 6789 x 0 : 1996
= 0
l) 54 x 113 + 45 x 113 + 113
= 113 (54 + 45 + 1)
= 113 x 100
= 11300
u) (500 x 9 - 250 x 18) x (1 + 2 + 3 + ... + 9)
= (2 x 250 x 9 - 250 x 2 x 9) x (1 +2 + 3 + ... + 9)
= 0 x (1 + 2 + 3 + ... + 9)
= 0
a, 2/3 - 2/9 + 7/9 = 6/9 - 2/9 + 7/9 = 10/9
b, 7/6 + 3/5 : 6 = 7/6 + 3/5 x 1/6 = 7/6 + 1/10 = 70/60 + 6/10 = 76/10 = 38/5
c, x : 6/25 = 18
x = 18 x 6/25
x = 36/25
d, ( 2/5 + 4/7) : x = 17/5
29/35 : x = 17/5
x = 29/35 : 17/5
x = 29/119
\(a.\dfrac{2}{3}-\dfrac{2}{9}+\dfrac{7}{9}=\dfrac{6}{9}-\dfrac{2}{9}+\dfrac{7}{9}=\dfrac{4}{9}+\dfrac{7}{9}=\dfrac{11}{9}\\ b.\dfrac{7}{6}+\dfrac{3}{5}:6=\dfrac{7}{6}+\dfrac{3}{5}\times\dfrac{1}{6}=\dfrac{7}{6}+\dfrac{1}{10}=\dfrac{70}{60}+\dfrac{6}{60}=\dfrac{76}{60}=\dfrac{19}{15}\\ c.x:\dfrac{6}{25}=18\\ x=18\times\dfrac{6}{25}\\ x=\dfrac{108}{25}\\ d.\left(\dfrac{2}{5}+\dfrac{4}{7}\right):x=\dfrac{17}{5}\\ \dfrac{34}{35}:x=\dfrac{7}{5}\\ x=\dfrac{34}{35}:\dfrac{7}{5}\\ x=\dfrac{34}{49}\)
= 113x4x25 - 112x5x5x4
= 113x100-112x25x4
= 113x100-112x100
= 100x(113-112)
= 100x1
= 100
4 x 113 x 25 - 5 x 112 x 20
=(4*25)*113-(5*20)*112
=100*113-100*112
=100*(113-112)
=100*1
=100.Vậy biểu thức trên có giá trị là 100
= (4 x 25) x 113 - (5 x 20) x 112
= 100 x 113 - 100 x 112
= 100 x (113 - 112)
= 100 x 1
= 100
4×113×25-5×112×20
=(4×25)×113-(5×20)×112)
=100×113-100×112
=100×(113-112)
=100×1
=100
2 x 8 x 50 x 25 x 125
= ( 125 x 8 ) x ( 50 x 2 ) x 25
= 1000 x 100 x 25
=2500000
4 x 125 x 25 x 8
= ( 125 x 8 ) x ( 25 x 4 )
= 1000 x 100
=100000
2 x 3 x 4 x 5 x 50 x 25
= ( 25 x 4 ) x ( 2 x 50 ) x ( 3 x 5 )
= 100 x 100 x 15
= 150000
25 x 20 x 125 x 8 - 8 x 20 x 5 x 125
= ( 25 x 20 ) x ( 125 x 8 ) - ( 20 x 5 ) x ( 125 x 8 )
= 500 x 1000 - 100 x 1000
= 500000 - 100000
= 400000
2 x 3 x 4 x 5 x 25
= (25 x 4 ) x ( 2 x 5 ) x 3
= 100 x 10 x 3
=1000 x 3
=3000
Hk tốt
4x113x25-5x112x20
=100x113-100x112
=100x(113-112)
=100x1
=100
k tôi nhá bn
4 x 113 x 25 - 5 x 112 x 20 - 50 x 2
= (25 x 4) x 113 - (20 x 5) x 112 - (50 x 2)
= 100 x 113 - 100 x 112 - 100
= 100 x 113 - 100 x 112 - 100 x 1
= 100 x (113 - 112 - 1)
= 100 x 0
= 0
cảm ơn bạn nhiều nhé @789000