解方程和比例
10-8.2=

63%+27%=

3.6÷0.6=

1.25×3.2=
5
6
-
3
4
=
6
7
×
2
3
=
3
17
÷
17
18
=
100×0.25=
1+1÷
1
3
=
1-
1
2
÷1-
1
2
=
2
3
+
2
3
×2=
4.304÷0.71≈
分析:本題根據(jù)小數(shù)、分?jǐn)?shù)的加法、減法、乘法、除法的運(yùn)算法則計(jì)算即可;
1.25×3.2可將3.2拆分為8×0.4計(jì)算;
2
3
+
2
3
×2可根據(jù)乘法分配律計(jì)算;
4.304÷0.71可按4.2÷0.7估算.
解答:
解:10-8.2=1.8,
63%+27%=90%,

3.6÷0.6=6,

1.25×3.2=4,
5
6
-
3
4
=
1
12
6
7
×
2
3
=
4
7
,
3
17
÷
17
18
=
54
289
,
100×0.25=25,
1+1÷
1
3
=4,
1-
1
2
÷1-
1
2
=0,
2
3
+
2
3
×2=2,
4.304÷0.71≈6.
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù),然后快速準(zhǔn)確得出答案.
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