问题 解答题
用简便方法计算
3
1
4
×4
3
5
-4.6×2
1
4
9.5×3.8+6
1
5
×(19×
1
2
14×72+42×76
4
19
×99
答案

(1)3

1
4
×4
3
5
-4.6×2
1
4

=3

1
4
×4.6-4.6×2
1
4

=(3

1
4
-2
1
4
)×4.6,

=1×4.6,

=4.6;

(2)9.5×3.8+6

1
5
×(19×
1
2
),

=9.5×3.8+6.2×9.5,

=9.5×(3.8+6.2),

=9.5×10,

=95;

(3)14×72+42×76,

=14×(3×24)+42×76,

=(14×3)×24+42×76,

=42×24+42×76,

=42×(24+76),

=42×100,

=4200;

(4)

4
19
×99,

=

4
19
×(95+4),

=

4
19
×95+4×
4
19

=5+

16
19

=5

16
19

单项选择题 A3/A4型题
单项选择题