问题 解答题
脱式计算(能简算的要简算)
1.25×0.25×3.2×1.7
1.3-3.79+9.7-6.21
1
4
+13÷4-11×25%
答案

(1)1.25×0.25×3.2×1.7,

=1.25×0.25×(0.8×4)×1.7,

=(1.25×0.8)×(0.25×4)×1.7,

=1×1×1.7,

=1.7;

(2)1.3-3.79+9.7-6.21,

=1.3+9.7-3.79-6.21,

=(1.3+9.7)-(3.79+6.21),

=11-10,

=1;

(3)6×

1
4
+13÷4-11×25%,

=6×

1
4
+13×
1
4
-11×
1
4

=(6+13-11)×

1
4

=8×

1
4

=2.

单项选择题
单项选择题