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\(\frac{1}{6}+\frac{2}{3}\)
\(=\frac{1}{6}+\frac{4}{6}\)
\(=\frac{1+4}{6}=\frac{5}{6}\)
a) 3/4x16/9-7/5:(-21/20)
=4/3-(-4/3)
=8/3
b)=7/3-1/3x[-3/2+(2/3+2)]
=7/3-1/3x[-3/2+8/3]
=7/3-1/3x7/6
=7/3-7/18
=35/18
c)=(20+37/4):9/4
=117/4:9/4
=13
d)=6-14/5x25/8-8/5:1/4
=6-35/4-32/5
=-11/4-32/5
=-183/20
=3/1-3/4+3/4-3/7+3/7-3/10+3/10-3/13
=1/1-1/4+1/4-1/7+1/7-1/10+1/10-1/13
=1-1/13
=12/13
toán lp 7 đúng k k pk toán lp 1 đâu
3/2-3/2:(-1/8)
=3/2-3/2.(-8)
=3/2(1+8)
=3/2x9
=27/2
\(\frac{3}{2}-\frac{3}{2}:-\frac{1}{2^3}\)
\(=\frac{3}{2}-\frac{3}{2}.\frac{-2^3}{1}\)
\(=\frac{3}{2}-\left(-12\right)\)
\(=\frac{3}{2}+\frac{24}{2}\)
\(=\frac{27}{2}\)
hok tốt!!!