Đáp án:
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`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`
