题目内容

计算下面各题(能简算的要简算)
①0.25×37+
1
4
+62÷4
②(
3
4
+
5
6
-
11
12
)÷12
③1.21×42-(4.46+
7
50

④3.5÷[1.4×(0.1-0.05)
①0.25×37+
1
4
+62÷4,
=
1
4
×37+
1
4
×1+62×
1
4

=(37+1+62)×
1
4

=100×
1
4

=25;

②(
3
4
+
5
6
-
11
12
)÷12,
=(
19
12
-
11
12
)÷12,
=
8
12
÷12,
=
1
18


③1.21×42-(4.46+
7
50
),
=1.21×42-4.6,
=50.82-4.6,
=46.22;

④3.5÷[1.4×(0.1-0.05)],
=3.5÷[1.4×0.05],
=3.5÷0.07,
=50.
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