(1)14×105-1890÷18
=1470-105
=1365
(2)1.25×(3.56×8)
=(1.25×8)×3.65
=10×3.65
=36.5
(3)63×[5/8]+63÷[8/3]
=63×[5/8]+63×[3/8]
=63×([5/8+
3
8])
=63×1
=63
(4)72×( [5/9]-[5/12])-10
=72×[5/9]-72×[5/12]-10
=40-30-10
=0
(5)(5.4-3.6÷1.2)×0.5
=2.4×0.5
=1.2
答:积是1.2.
(6)32-25%x=18
32-0.25x=18
0.25x=14
x=56
答:这个数56.