a ) -3/7 nhân 6//13 + -4/7 nhân 6/13 + -7/13
b) 7/8 + 13/16 : 26 – 6/24 nhân (-2) mũ 3
c ) 12 nhân 3 nhân ( -4) nhân 5 nhân 36/ 100 nhân 54
d) 27/60 – 15/120 + 93/10 -33/24
a ) -3/7 nhân 6//13 + -4/7 nhân 6/13 + -7/13 b) 7/8 + 13/16 : 26 – 6/24 nhân (-2) mũ 3 c ) 12 nhân 3 nhân ( -4) nhân 5 nhân 36/ 100 nhân 54 d) 27/60 –
By Maya
a)-3/7 .6/13 + (-4/7) . 6/13 + (-7/13)
=6/13(-3/7-4/7)+(-7/13)
=6/13(-1)+(-7/13)
=-6/13+(-7/13)
=-1
b) 7/8 + 13/16 : 26 – 6/24 . (-2)^ 3
=7/8 + 13/16 : 26 – 6/24 .(-8)
=7/8 +1/32-(-2)
=28/32+1/32+64/32
=93/32
c)12 . 3. ( -4) . 5. 36/ 100 .54
=36.(-20). 36/ 100 .54
=36(-36/5).54
=-1296/5.54
=-69984/5
d)27/60 – 15/120 + 93/10 -33/24
=9/20-1/8+93/10-11/8
=(9/20+93/10)+(-1/8-11/8)
=(9/20+186/20)+(-1/8-11/8)
=(9+186)/20+[(-1-11)/8]
=39/4+(-12)/8
=78/8+(-12)/8
=[78+(-12)]/8
=33/4
Đáp án:
$\\$
`a,`
`(-3)/7 × 6/13 + (-4)/7 × 6/13 + (-7)/13`
`= 6/13 × ( (-3)/7 + (-4)/7) + (-7)/13`
`= 6/13 × (-1) + (-7)/13`
`= (-6)/13 + (-7)/13`
`= (-6 + (-7) )/13`
`= (-13)/13`
`= -1`
$\\$
`b,`
`7/8 + 13/16 ÷ 26 – 6/24 × (-2)^3`
`= 7/8 + 13/16 × 1/26 – 6/24 × (-8)`
`= 7/8 + 1/32 – (-2)`
`= 28/32 + 1/32 + 64/32`
`= (28 + 1 + 64)/32`
`= 93/32`
$\\$
`c,`
`12 × 3 × (-4) × 5 × 36/100 × 54`
`= 36 × (-4) × 5 × 36/100 ×54`
`= -144 × 5 × 36/100 × 54`
`= -720 × 36/100 × 54`
`= (-1296)/5 × 54`
`= (-69984)/5`
$\\$
`d,`
`27/60 – 15/120 + 93/10 – 33/24`
`= 9/20 – 1/8 + 93/10 – 11/8`
`= (9/20 + 93/10) + (-1/8 – 11/8)`
`= (9/20 + 186/20) + (-1/8 – 11/8)`
`= (9 + 186)/20 + (-1 – 11)/8`
`= 39/4 + (-12)/8`
`= 78/8 + (-12)/8`
`= (78 + (-12) )/8`
`= 33/4`