题目内容

79×125
85×101-85
83×152-83×53+83
428+754+146+72
5.25×12×9
7
12
-
9
12
+
5
12
(1)79×125,
=(80-1)×125,
=80×125-125,
=10000-125,
=9875;

(2)85×101-85,
=85×(101-1),
=85×100,
=8500;

(3)83×152-83×53+83,
=83×(152-53+1),
=83×100,
=8300;

(4)428+754+146+72,
=(428+72)+(754+146),
=500+900,
=1400;

(5)5.25×12×9,
=(5.25×4)×(3×9),
=21×27,
=567;

(6)
7
12
-
9
12
+
5
12

=
1
4
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