(-125).(-14).(-8).(-3) cứu
(-14) . (-125) . (+3) . (-8)
\(\left(-14\right).\left(-125\right).\left(+3\right).\left(-8\right)\)
\(=\left(-125\right).\left(-8\right).\left(-14\right).\left(+3\right)\)
\(=1000.\left(-14\right).\left(+3\right)\)
\(=\left(-14000\right).\left(+3\right)\)
\(=-42000\)
(-14) . (-125) . (+3) . (-8)
= 1000.(-43)
= -42000
Bài 1
4 * 3 * 25 *125 * 8
4 * 3 * 25 *125 * 8
=(4*25) * (125 *8) * 3
= 100 * 1000 * 3
= 300 000
4x3x25x125x8
=(4x25)x(125x8)x3
=100x1000x3
=300 000
Tính bằng cách hợp lý:
a) ( − 125 ) . ( − 5 ) .8. ( − 2 )
b) ( − 127 ) . ( 1 − 582 ) − 582.127
c) ( 43 − 13 ) . ( − 3 ) + 27. ( − 14 − 16 )
d) 125. ( − 61 ) . ( − 2 ) 3 . ( − 1 ) 2 n ( n ∈ ℕ * )
a) ( − 125 ) . ( − 5 ) .8. ( − 2 ) = ( − 125 ) .8. ( − 5 ) . ( − 2 ) = − 1000.10 = − 10000
b) ( − 127 ) . ( 1 − 582 ) − 582.127 = ( − 127 ) . ( − 581 ) − 582.127 = 127.581 − 582.127 = 127 ( 581 − 582 ) = 127. ( − 1 ) = − 127
c) ( 43 − 13 ) . ( − 3 ) + 27. ( − 14 − 16 ) = 30. ( − 3 ) + 27. ( − 30 ) = ( − 30 ) .3 + 27. ( − 30 ) = ( − 30 ) . ( 3 + 27 ) = ( − 30 ) .30 = − 90
d) 125. ( − 61 ) . ( − 2 ) 3 . ( − 1 ) 2 n = 125. ( − 62 ) . ( − 8 ) .1 = 125. ( − 8 ) . ( − 62 ) = − 1000. ( − 62 ) = 62000
3+2=?
2+10=?
2+2+7+14+25=?
8+8+8+8+9+8
100+125=?
3+2= 5
2+10= 12
2+2+7+14+25= 50
8+8+8+8+9+8= 49
100+125= 225
3+2=5
2+10=12
2+2+7+14+25=50
8+8+8+8+9+8=49
100+125=225
3+2=5
2+10=12
2+2+7+14+25=50
8+8+8+8+9+8=49
100+125=225
D=5^10×7^3+25^8×49^2/(125)^3+5^9×14^3
Tính nhanh.
a) (-4).(-8).(-17).(-25).125
b) (236 – 362) – (638 + 463)
c) (- 325 – 147) – ( - 625 + 853) – (-96)
d) 69.(- 47) – 31. (- 47)
e) 98. (- 37) + (- 49).126
f) – 35. (49 – 125) – 125 .(35 – 49)
g) 2 + 4 – 6 – 8 + 10 + 12 – 14 – 16 + …+ 90 + 92 – 94 – 96
h) 1 + 3 + 3 2 + 3 3 + ….+ 3 50
A. Tính nhanh : 2018 * 3/4 + 2018 * 1/4 - 2018
B. Tính bằng cách thuận tiện nhất :
a) 3 * 125 + 3 * 125 / 6 * 43 + 6 * 57
b) 14/18 * 8/5 - 7/9 * 3/5
\(2018\times\frac{3}{4}+2018\times\frac{1}{4}-2018\)
\(=2018\times\left(\frac{3}{4}+\frac{1}{4}-1\right)\)
\(=2018\times0=0\)
B-a:tương tự bài A
b,\(\frac{14}{18}\times\frac{8}{5}-\frac{7}{9}\times\frac{3}{5}\)
\(=\frac{7}{9}\times\frac{8}{5}-\frac{7}{9}\times\frac{3}{5}\)
\(=\frac{7}{9}\times\left(\frac{8}{5}-\frac{3}{5}\right)\)
\(=\frac{7}{9}\times1=\frac{7}{9}\)\
thanks
B-a,\(\frac{3\times125+3\times125}{6\times43+6\times57}=\frac{2\times3\times125}{6\times\left(43+57\right)}\)
\(=\frac{3\times250}{6\times100}=\frac{5}{2\times2}=\frac{5}{4}\)
thanks
A) 2018*3/4+2018*1/4-2018
=2018*(3/4+1/4)-2018
=2018*4/4-2018
=2018*1-2018
=2018-2018
=0
bn thông cảm mình có việc bận,chút nữa mình trả lời câu B
Tìm x,biết:
A) 8 + ( x - 9)= 125 - 64
B) 5×(x+7) -10 = 8×5
C) 7 × 7 - 7( 13 - 2× x) = 14
D) 320 : (x - 1) = ( 125 - 5 ×5 ) : 4 + 15
E) 240 : ( x -5 ) = 4 × 5 ×5 - 60 : 3
F) 49 × x - 14 × x = 49 × 10 - 70
a. 8 + (x - 9) = 125 - 64
8 + (x - 9) = 61
x - 9 = 53
x = 62
b. 5 x (X + 7) - 10 = 8 x 5
5 x (X + 7) - 10 = 40
5 x (X + 7) = 50
X + 7 = 10
X = 3
tính:
a,17-11-14-(-39)
b,125-4[3-7(-2)]
c, (-2)^7:(-2)^4+8
d,(-14).9-13.(-9)
a) 17-11-14-(-39)
=6-14+39
=-8+39
=31
b) 125-4.[3-7(-2)]
=125-4.[3-14]
=125-4(-11)
=125-44
=81
c) (-2)^7:(-2)^4+8
=-8+8
=0
d) (-14).9-13.(-9)
=-9.[(-14)-13]
=-9.(-27)
=243
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