Question

260-0=	72÷8=	302×4=	131×0=	450-70=
102×4=	700×4=	93+40=	398×5=	21×5≈
102×4≈	510×9≈	1 4 + 2 4 =	4 7 + 2 7 =	5 8 - 3 8 =
3 4 - 1 4 =	5 10 - 1 10 =	1- 5 6 =	1- 1 2 =	1 2 + 1 2 =
4 5 - 4 5 =．

Answer 1

分析：根据整数四则运算的运算法则和分数加减法的计算方法计算即可．

解答：解：

260-0=260	72÷8=9	302×4=128	131×0=0	450-70=380
102×4=408	700×4=2800	93+40=133	398×5=1990	21×5≈100
102×4≈400	510×9≈4590	1 4 + 2 4 = 3 4	4 7 + 2 7 = 6 7	5 8 - 3 8 = 1 4
3 4 - 1 4 = 1 2	5 10 - 1 10 = 2 5	1- 5 6 = 1 6	1- 1 2 = 1 2	1 2 + 1 2 =1
4 5 - 4 5 =0．

点评：本题考查了整数四则运算的运算法则和分数加减法的计算方法的运用．