Toán Lớp 6: a) 7/15+8/21×7/16
b)8/15-3/16×4/9
c)1/12:-1/4-(-1/8)mũ 2
giúp mik vs.
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Toán Lớp 6: a) 7/15+8/21×7/16
b)8/15-3/16×4/9
c)1/12:-1/4-(-1/8)mũ 2
giúp mik vs.
Comments ( 2 )
Giải đáp:
$a/$ $\dfrac{7}{15}$ $+$ $\dfrac{8}{21}$ $\times$ $\dfrac{7}{16}$
$=$ $\dfrac{7}{15}$ $+$ $\dfrac{1}{21}$ $\times$ $\dfrac{7}{2}$
$=$ $\dfrac{7}{15}$ $+$ $\dfrac{1}{3}$ $\times$ $\dfrac{1}{2}$
$=$ $\dfrac{7}{15}$ $+$ $\dfrac{1}{6}$
$=$ $\dfrac{19}{30}$
$b/$ $\dfrac{8}{15}$ $-$ $\dfrac{3}{16}$ $\times$ $\dfrac{4}{9}$
$=$ $\dfrac{8}{15}$ $-$ $\dfrac{1}{16}$ $\times$ $\dfrac{4}{3}$
$=$ $\dfrac{8}{15}$ $-$ $\dfrac{1}{4}$ $\times$ $\dfrac{1}{3}$
$=$ $\dfrac{8}{15}$ $-$ $\dfrac{1}{12}$
$=$ $\dfrac{9}{20}$
$c/$ $\dfrac{1}{12}$ $:$ $-$$\dfrac{1}{4}$ $-$ $($ $-$ $\dfrac{1}{8}$ $)$ $^{2}$
$=$ $-$ $\dfrac{1}{12}$ $:$ $\dfrac{1}{4}$ $-$ $($ $-$ $\dfrac{1}{8}$ $)$ $^{2}$
$=$ $-$ $\dfrac{1}{12}$ $\times$ $4$ $-$ $($ $-$ $\dfrac{1}{8}$ $)$ $^{2}$
$=$ $-$ $\dfrac{1}{12}$ $\times$ $4$ $-$ $\dfrac{1}{64}$
$=$ $-$ $\dfrac{1}{3}$ $-$ $\dfrac{1}{64}$
$=$ $-$ $\dfrac{67}{192}$
$#thuanhuy$
$\text{Gửi bn!}$
a) 7/15 + 8/21 xx 7/16
= 7/15 + 56/336
= 7/15 + 1/6
= 14/30 + 5/30
= 19/30
b) 8/15 – 3/16 xx 4/9
= 8/15 – 12/144
= 8/15 – 1/12
= 32/60 – 5/60
= 27/60
= 9/20
c) 1/12 : (-1)/4 – (-1/8)^2
= 1/12. (-4) – 1/64
= (-1)/3 – 1/64
= (-64)/192 – 3/192
= (-67)/192