题目内容

能用简便方法的用简便方法.
(1)6502+672÷28×17
(2)3.4×2.79+0.21×3.4
(3)(
5
12
+
1
9
+
3
8
)×72
(4)[(
1
2
-
1
5
3
4
3
5
(1)6502+672÷28×17,
=6502+24×17,
=6502+408,
=6910;

(2)3.4×2.79+0.21×3.4,
=3.4×(2.79+0.21),
=3.4×3,
=10.2;

(3)(
5
12
+
1
9
+
3
8
)×72,
=
5
12
×72+
1
9
×72+
3
8
×72,
=30+8+27,
=38+27,
=65;

(4)[(
1
2
-
1
5
3
4
3
5

=[
3
10
÷
3
4
3
5

=
2
5
÷
3
5

=
2
3
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