题目内容

下面各题怎样简便就怎样计算(求未知数X).
5.02-1.37-2.63
12
5
×(
5
6
+
1
2
)+0.8
1
5
:X=0.32:4.8
1.25×2.5×32
11÷〔
6
11
×(
3
4
+
1
6
)〕
(1)5.02-1.37-2.63;
=5.02-(1.37+2.63),
=5.02-4,
=1.02;

(2)
12
5
×(
5
6
+
1
2
)+0.8,
=
12
5
×
5
6
+
12
5
×
1
2
+0.8,
=2+1.2+0.8,
=2+(1.2+0.8),
=2+2,
=4;

(3)
1
5
:x=0.32:4.8,
0.32x=0.2×4.8,
0.32x=0.96,
0.32x÷0.32=0.96÷0.32,
x=3;

(4)1.25×2.5×32,
=(1.25×8)×(2.5×4),
=10×10,
=100;

(5)11÷[
6
11
×(
3
4
+
1
6
)],
=11÷[
6
11
×
11
12
],
=11÷
1
2

=22.
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