用简便方法计算125×8.81.3+4.25+3.7+3.754.8×1.0117.16-(3.5-2.85)3.4×99+3.41321×17+1721×8725×1001779÷115+511×2964.2×87+64.2×13.-六年级数学

题文

用简便方法计算
125×8.81.3+4.25+3.7+3.754.8×1.01
17.16-(3.5-2.85)3.4×99+3.4
13
21
×17+
17
21
×8
7
25
×100
1
7
7
9
÷
11
5
+
5
11
×
2
9
64.2×87+64.2×13.
题型:解答题  难度:中档

答案

(1)125×8.8,
=125×8×1.1,
=1000×1.1,
=1100;

(2)1.3+4.25+3.7+3.75,
=(1.3+3.7)+(4.25+3.75),
=5+8,
=13;

(3)4.8×1.01,
=4.8×1+4.8×0.01,
=4.8+0.048,
=4.848;

(4)17.16-(3.5-2.85),
=17.16+2.85-3.5,
=20.01-3.5,
=16.51;

(5)3.4×99+3.4,
=3.4×(99+1),
=3.4×100,
=340;

(6)
13
21
×17+
17
21
×8,
=(
13
21
+
8
21
)×17,
=1×17,
=17;

(7)
7
25
×100
1
7

=
7
25
×100+
7
25
×
1
7

=28+
1
25

=28
1
25


(8)
7
9
÷
11
5
+
5
11
×
2
9

=(
7
9
+
2
9
)×
5
11

=1×
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