13.7-3.6-4.3-2.1
0.59×101
2.5×12.5×40×0.8
()×24
24×+75÷5+
9×3.45+11.1×180%+54.3÷
28×301%≈
1-=
425﹣199=
557÷69≈
5.2÷0.125÷8=
÷=
+=
8.2﹣2=
7-=
×0+3=
竿高
1m
1.5m
2m
影长
0.3m
0.45m
0.6m
在同一时刻,量得塔影长3.6,算算塔高多少米?