a)36,4 x 99 + 36 +0,4
= 36,4 x 99 + ( 36 + 0, 4 )
= 36,4 x 99 + 36,4
= 36,4 x 100
= 3640
b)9/8 - [ 17/7 - 3/7 ] + 7/8
= ( 9/8 + 7/8 ) - [ 17/7 - 3/7 ]
= 16 / 8 - 14/7
= 2 - 2
=0
HỌC TỐT#
\(36,4\times99+36\times0,4\)
\(=\left(36,4-0,4\right)+36\times99\)
\(=36+36\times99\)
\(=36\times1+36\times99\)
\(=36\times\left(99+1\right)\)
\(=36\times100=3600\)
\(\frac{9}{8}-\left(\frac{17}{7}-\frac{3}{7}\right)+\frac{7}{8}\)
\(=\left(\frac{9}{8}+\frac{7}{8}\right)-\left(\frac{17}{7}-\frac{3}{7}\right)\)
\(=2-2=0\)
kk