题目内容

(1)26.86×25.66-16.86×25.66
(2)52.3×0.68+3.2×5.23
(3)
16
23
×27+
19
23
×16

(4)99+99×99+99×99×99.
(1)26.86×25.66-16.86×25.66,
=(26.86-16.86)×25.66,
=10×25.66,
=256.6;

(2)52.3×0.68+3.2×5.23,
=5.23×6.8+3.2×5.23,
=5.23×(6.8+3.2),
=52.3;

(3)
16
23
×27+
19
23
×16

=
27
23
×16+
19
23
×16,
=16×(
27
23
+
19
23
),
=16×
46
23

=16×2,
=32;

(4)99+99×99+99×99×99,
=99+99×99×(1+99),
=99+99×9900,
=99×(1+9900),
=(100-1)×9901,
=990100-9901,
=980199.
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