9X6+10+3X66666-13+(16X56)=
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a) \(\frac{8}{21}+\frac{13}{21}=\frac{8+13}{21}=\frac{21}{21}=1\)
b) \(\frac{5}{6}:\frac{-7}{12}=\frac{5}{6}.\frac{12}{-7}=\frac{10}{-7}\)
c) \(-4\frac{1}{4}-\frac{3}{4}=\frac{-17}{4}-\frac{3}{4}=\frac{-17-3}{4}=\frac{-20}{4}=-5\)
d) \(\frac{7}{9}.\frac{8}{17}+\frac{7}{9}.\frac{15}{17}-\frac{7}{9}.\frac{6}{17}\)
\(=\frac{7}{9}.\left(\frac{8}{17}+\frac{15}{17}-\frac{6}{17}\right)\)
\(=\frac{7}{9}.\frac{17}{17}\)
\(=\frac{7}{9}.1\)
\(=\frac{7}{9}\)
a) \(\frac{8}{21}+\frac{13}{21}=1\)
b) \(\frac{5}{6}\div\frac{-7}{12}=\frac{5}{6}.\frac{-12}{7}=\frac{-10}{7}\)
c) \(-4\frac{1}{4}-\frac{3}{4}=\frac{-17}{4}-\frac{3}{4}=-5\)
d) \(\frac{7}{9}.\frac{8}{17}+\frac{7}{9}.\frac{15}{7}-\frac{7}{9}.\frac{6}{17}=\frac{7}{9}.\left(\frac{8}{17}+\frac{15}{17}-\frac{6}{17}\right)=\frac{7}{9}.1=\frac{7}{9}\)
a) 2/6 x 7/5
= 1/3 x 7/5
= 7/15
b) 11/9 x 5/10
= 11/9 x 1/2
= 11/18
c) 3/9 x 6/8
= 1/3 x 3/4
= 1/4
Chúc em học giỏi !
2/6 x 7/5 = 1/3 x 7/5 = 7/15
11/9 x 5/10 = 11/9 x 1/2 = 11/18
3/9 x 6/8 = 1/3 x 3/4 = 3/12 = 1/3
Tíck mk nha !!
a) 11/15 + 5/7 + 2/7 + 4/15
= ( 11/15 + 4/15 ) + ( 5/7 + 2/7 )
= 1 + 1
= 2
b ) 5/9 x 1/2 + 5/9 x 6/4
= 5/9x ( 1/2 + 6/4 )
= 5/9 x 2
= 10/9
c) 7/8 : 1/2 + 9/8 : 1/2
= ( 7/8 + 9/8 ) ; 1/2
= 2 : 1/2
= 4
d) 17/10 + 1/2 - 7/10
= ( 17/10 - 7/10 ) + 1/2
= 1 + 1/2
= 3/2
\(\frac{9\cdot6-9\cdot2}{18}\)
\(=\frac{9\left(6-2\right)}{18}\)
\(=\frac{9\cdot4}{18}\)
\(=\frac{36}{18}\)
\(=2\)
9X6+10+3X66666-13+(16X56)=200945