a)-5/6 .12/7 . ( -21/15)
b)1/6 . 9/-9 . ( -12/11)
c) (17/18 : 51/36) . 3/5
d) (1/7)^2 . 7^2
e) (0,125)^3 . 512
f) (0,25)^4 . 1024
a)-5/6 .12/7 . ( -21/15)
b)1/6 . 9/-9 . ( -12/11)
c) (17/18 : 51/36) . 3/5
d) (1/7)^2 . 7^2
e) (0,125)^3 . 512
f) (0,25)^4 . 1024
Giải thích các bước giải:
a)$\frac{-5}{6}$ .$\frac{12}{7}$ .$\frac{-21}{15}$
= $\frac{-5.12.(-21)}{6.7.15}$
=$\frac{1260}{630}$ =2
b) $\frac{1}{6}$ .$\frac{9}{-9}$ .$\frac{-12}{11}$
=$\frac{1}{6}$ .(-1) .$\frac{-12}{11}$
$\frac{1.(-1).(-12)}{6.11}$
=$\frac{12}{66}$ =$\frac{2}{11}$
c) ($\frac{17}{18}$ : $\frac{51}{36}$ ).$\frac{3}{5}$
=$\frac{2}{3}$ .$\frac{3}{5}$
=$\frac{2}{5}$
d) ($\frac{1}{7}$ )$^{2}$ .7$^{2}$
=$\frac{1}{49}$ .49=1
e) (0.125)$^{3}$ .512
=($\frac{1}{8}$ )$^{3}$ .512
=$\frac{1}{512}$ .512=1
f) (0.25)$^{4}$ .1024
=1/256.1024=4
`a)(-5/6) . 12/7 . (-21/15)`
`=(-10/7) . (-21/15)`
`=2`
`b)1/6 . 9/(-9) . (-12/11)`
`=1/6 .(-1). (-12/11)`
`=(-1/6) . (-12/11)`
`=2/11`
`c)(17/18:51/36) . 3/5`
`=(17/18 . 36/51). 3/5`
`=2/3 . 3/5`
`=2/5`
`d)(1/7)^2 . 7²`
`=(1/7 .7)^2`
`=1^2`
`=1`
`e)(0,125)³ .512`
`=(0,125)³ .8³`
`=(0,125.8)³`
`=1³`
`=1`
`f)(0,25)^4 .1024`
`=(0,25)^4 .256.4`
`=(0,25)^4 .4^4.4`
`=(0,25.4)^4 .4`
`=1^4 .4`
`=1.4`
`=4`