4189÷71=59
0.160.61 3.01吨3.010吨
0.0580. 052 9.5米9米5厘米
35×102 72÷[960÷(245-165)]
415-176-24 125×89×8
3600÷25÷8 428×78+ 572×78
0.88+0.87-0.86+0.85-0.84
1.5×1= 910÷70= 2.2﹣1.9= 6÷7= 435+199=
+= -= ÷= 20×= ×=