题目内容

简便计算.
3.6÷4+7.4×
1
4
-25%=
2
15
+
3
17
)×15×17=
403×101=12.5×32×2.5=
99×
1
4
+
1
4
=
16.78-3.4-4
3
5
=.
(1)3.6÷4+7.4×
1
4
-25%,
=3.6×
1
4
+
7.4×
1
4
-
1
4

=(3.6+7.4-1)×
1
4

=10×
1
4

=2.5;

(2)(
2
15
+
3
17
)×15×17,
=
2
15
×
15×17+
3
17
×15×17

=34+45,
=79;

(3)403×101,
=403×100+403×1,
=40300+403,
=40703;

(4)12.5×32×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;

(5)99×
1
4
+
1
4

=(99+1)×
1
4

=100×
1
4

=25;

(6)16.78-3.4-4
3
5

=16.78-(3.4+4.6),
=16.78-8,
=8.78.
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