题目内容

77×42+23×4299×15+15
201×2496×43
49×101-4977×99+77
125×32×25540÷12÷5
28×111-28×1163×8+91×63+63
24×2577×63+77×91.
(1)77×42+23×42,
=(77+23)×42,
=100×42,
=4200;

(2)99×15+15,
=(99+1)×15,
=100×15,
=1500;

(3)201×24,
=(200+1)×24,
=200×24+1×24,
=4800+24,
=4824;

(4)96×43,
=(100-4)×43,
=4300-123,
=4071;

(5)49×101-49,
=(101-1)×49,
=100×49,
=4900;

(6)77×99+77,
=77×(99+1),
=77×100,
=7700;

(7)125×32×25,
=(125×8)×(4×25),
=1000×100,
=100000;

(8)540÷12÷5,
=540÷(12×5),
=540÷60,
=9;

(9)28×111-28×11,
=28×(111-11),
=28×100,
=2800;

(10)63×8+91×63+63,
=63×(8+91+1),
=63×100,
=6300;

(11)24×25,
=6×(4×25),
=6×100,
=600;

(12)77×63+77×91,
=77×(63+91),
=77×154,
=11858.
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