问题 解答题
简便计算
68-7.5+32
3
4
+
1
3
+
1
4
8
9
-(
1
4
-
1
9
)-
3
4
32×97+16×2×3.
答案

(1)68-7.5+32,

=(68+32)-7.5,

=100-7.5,

=92.5;

(2)

3
4
+
1
3
+
1
4

=(

3
4
+
1
4
)+
1
3

=1+

1
3

=1

1
3

(3)

8
9
-(
1
4
-
1
9
)-
3
4

=

8
9
-
1
4
+
1
9
-
3
4

=(

8
9
+
1
9
)-(
1
4
+
3
4
),

=1-1,

=0;

(4)32×97+16×2×3,

=32×97+32×3,

=32×(97+3),

=32×100,

=3200.

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