=-26 nhé

= -26

tk mik mik tk lại

bằng -18

/ là phần

lz-12l=98

\(\Rightarrow\)z-12=98 hoac z-12=-98

th1:z-12=98

z=98+12

z=110

th2:z-12=-98

z=-98+12

z=-86

vay z=110 hoac z = -86

lx-98l=0+98

lx-98l=98

\(\Rightarrow\)x-98=98 hoac x-98=-98

th1:x-98=98

x=98+98

x=196

th2:x-98=-98

x=-98+98

x=0

vay x=196 hoac x = 0

chuan do nhe   l i k e    mk nha

Đáp án cần chọn là: D

Đáp án là D

Ta có: (-98) + 8 + 12 + 98 = [(-98) + 98] + (8 + 12)

     = 0 + 20 = 20

\(\frac{15-\frac{15}{7}-\frac{15}{12}-\frac{15}{98}}{18-\frac{18}{7}-\frac{18}{12}-\frac{18}{98}}\)= \(\frac{15-15\left(\frac{1}{7}+\frac{1}{12}+\frac{1}{98}\right)}{18-18\left(\frac{1}{7}+\frac{1}{12}+\frac{1}{98}\right)}\)=\(\frac{15\left(1-\frac{1}{7}-\frac{1}{12}-\frac{1}{98}\right)}{18\left(1-\frac{1}{7}-\frac{1}{12}-\frac{1}{98}\right)}\)= \(\frac{15}{18}\)=\(\frac{5}{6}\)

cảm ơn nhìu

\(\frac{15-\frac{15}{7}-\frac{15}{12}-\frac{15}{98}}{18-\frac{18}{7}-\frac{18}{12}-\frac{18}{98}}=\frac{15\left(1+\frac{1}{7}+\frac{1}{12}+\frac{1}{98}\right)}{18\left(1+\frac{1}{7}+\frac{1}{12}+\frac{1}{98}\right)}=\frac{15}{18}=\frac{5}{6}\)

\(15-\frac{15}{7}-\frac{15}{12}-\frac{1}{98}\)

\(=15\left(1-\frac{1}{7}-\frac{1}{12}-\frac{1}{98}\right)\)

\(=15x\frac{449}{588}=\frac{2245}{196}\)

\(18-\frac{18}{7}-\frac{18}{12}-\frac{18}{98}\)

\(=18\left(1-\frac{1}{7}-\frac{1}{12}-\frac{1}{98}\right)\)

\(=18x\frac{449}{588}=\frac{1347}{98}\)