15.7+3.58+4.3+5.42 8×14×125 25+25×39 1680÷[(121-109)×4]
0.03+0.52= 3-0.3= 2.5×0.4= 0.4×0.7=
28×25 125×72
16×2×50 8×57×125
25×277×4 8×25×125×4
64+36 36+64
24×98+2 24×(98+2)
25×4×40 25×(40+4)
360×25 180×50
竹竿高(m)
2
3
6
影长(m)
1.6
2.4
4.8