Tính bằng cách thuận tiện:
a) 2,35 x 7 + 3 x 2,35
=..................
=..................
b) 6,75 x 12 - 2 x 6,75
=..................
=..................
c) 4 x 37,65 x 25
=..................
=..................
d) 20 x 16,47 : 2
=..................
=..................
a)2.25x7+3x2,25
=2,25(7+3)
=2,25.10
=22,5
\(a.=2,35\times\left(7+3\right)\)
\(=2,35\times10\)
\(=23,5\)
\(b.=6,75\times\left(12-2\right)\)
\(=6,75\times10\)
\(=67,5\)
\(c.=25\times4\times37,65\)
\(=100\times37,65\)
\(=3765\)
\(d.=20:2\times16,47\)
\(=10\times16,47\)
\(=164,7\)