Đáp án:
Giải thích các bước giải:
a/$\frac{-19}{34}$($\frac{17}{19}$+$\frac{49}{18}$)+$\frac{49}{18}$($\frac{19}{34}$-$\frac{18}{7}$)
=$\frac{-19}{34}$x$\frac{17}{19}$+$\frac{-19}{34}$x$\frac{49}{18}$+$\frac{49}{18}$x$\frac{19}{34}$-$\frac{49}{18}$x$\frac{18}{7}$
=$\frac{-19}{34}$x$\frac{17}{19}$ +$\frac{49}{18}$($\frac{-19}{34}$+$\frac{19}{34}$-$\frac{18}{7}$)
=$\frac{-19}{34}$x$\frac{17}{19}$ +$\frac{49}{18}$(0-$\frac{18}{7}$)
=-2+$\frac{49}{18}$x$\frac{-18}{7}$
=-2+-7
=-9
b)29/32(41/36-32/58)-41/36(29/32+18/41)
=29/32x41/36-29/32x32/58-41/36x29/32+41/36x18/41
=29/32(41/36-32/58-41/36)+41/36x18/41
=29/32(-32/58)+41/36x18/41
=-1/2+1/2
=0
c)47/51(17/94-53/91)-53/91(91/53-47/51)
=47/51x17/94-47/51x53/91-53/91x91/53-53/91x47/51
=47/51(17/94-53/91-53/91)-53/91x91/53
=47/51(-17/94)-1
=-1/6-1
=-1/6-6/6
=-7/6
Chúc bạn học tốt!!!
