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1
3
-
1
4
=
5-
5
7
=
4
27
×
9
16
=
2-
2
3
×2=
1047-998=
1
4
+
1
6
=
3.7+1.9= 2÷14+
6
7
=
225+475= 19.3-2.7=
1
2
+
3
4
=
3.2×0.25-0.25=
1
8
×32×
1
4
=
7
4
-4×
1
4
=
1
8
+
1
3
)×24=
分析:(1)(2)(6)(11)通分计算;(3)(13)约分计算:(4)先算乘法,再算减法;(5)(7)(9)(10)注意数位对齐;(8)把除法写成分数,再计算;(12)(15)运用乘法分配律简算;(14)先算乘法,再算减法.
解答:解:
1
3
-
1
4
=
1
12
5-
5
7
=
30
7
4
27
×
9
16
=
1
12
2-
2
3
×2=
2
3
1047-998=49
1
4
+
1
6
=
5
12
3.7+1.9=5.6 2÷14+
6
7
=1
225+475=700 19.3-2.7=16.6
1
2
+
3
4
=
5
4
3.2×0.25-0.25=0.55
1
8
×32×
1
4
=1
7
4
-4×
1
4
=
3
4
1
8
+
1
3
)×24=11
点评:此题考查了小数、分数的四则运算,注意约分、通分、运算顺序以及灵活简算.
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