79米=千米 1.6公顷=平方米
54.3÷=0.543 3.49×=3490
8.1×100=
0.25×6=
0.05×0.04 =
0.3×50=
0.72÷8=
2.8÷100=
0.3÷0.03=
1.4÷0.04=
102×0.57 36.3×7.2-16.3×7.2
12.5×32×0.25 6.8÷(0.5+0.3×4)