(-14) . (-125) . (+3) . (-8)
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4 * 3 * 25 *125 * 8
=(4*25) * (125 *8) * 3
= 100 * 1000 * 3
= 300 000
\(\left(-125\right)\cdot\left(-14\right)\cdot\left(-8\right)\cdot\left(-3\right)\)
\(=\left[\left(-125\right)\cdot\left(-8\right)\right]\cdot\left[\left(-14\right)\cdot\left(-3\right)\right]\)
\(=\left(125\cdot8\right)\cdot\left(14\cdot3\right)\)
\(=1000\cdot42\)
\(=42000\)
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
\(2018\times\frac{3}{4}+2018\times\frac{1}{4}-2018\)
\(=2018\times\left(\frac{3}{4}+\frac{1}{4}-1\right)\)
\(=2018\times0=0\)
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. 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
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
= 1750 . -24
= -42000
\(\left(-14\right).\left(-125\right).\left(+3\right).\left(-8\right)\)
\(=\left(-125\right).\left(-8\right).\left(-14\right).\left(+3\right)\)
\(=1000.\left(-14\right).\left(+3\right)\)
\(=\left(-14000\right).\left(+3\right)\)
\(=-42000\)