A-A+

①841819×10.375+105119×38②1321130÷131③19931993×

2022-08-14 03:01:34 问答库 阅读 200 次

问题详情

①8418

19

×10.375+1051

19

×3

8

②1321

130

÷131

③19931993×1993-19931992×1992-19931992④276+543×275

276×543-267

⑤7

6

+13

12

+21

20

+31

30

+43

42

+57

56

+73

72

+91

90

参考答案

(1)841819×10.375+105119×38,
=841819×(10+38)+105119×38,
=841819×10+38×841819+105119×38,
=(85-119)×10+(841819+105119)×38,
=850-1019+190×38,
=850-1019+7114,
=850+7114-1019,
=92114-1019,
=9205576;

(2)1321130÷131,
=132×130+1130×1131,
=132×130+1130×131,
=131×131130×131,
=131130;

(3)19931993×1993-19931992×1992-19931992,
=(19931992+1)×1993-19931992×1992-19931992,
=19931992×1993-19931992×1992-19931992+1993,
=19931992×(1993-1992-1)+1993,
=19931992×0+1993,
=1993;

(4)276+543×275276×543-267,
=276+543×275(275+1)×543-267,
=276+543×275275×543+543-267,
=276+543×275275×543+275,
=1;

(5)76+1312+2120+3130+4342+5756+7372+9190,
=1+16+1+112+1+120+1+130+1+142+1+156+1+172+1+190,
=(1++1+1+1+1+1+1+1)+(16+112+120+130+142+156+172+190),
=8+(12-13+13-14+14-15+15-16+16-17+17-18+18-19+19-110),
=8+(12-110),
=8+25,
=825.

考点: