A-A+

(56+712+23)×481835×1920+225×1920-19204113×34+5

2022-08-14 02:15:07 问答库 阅读 200 次

问题详情

(5

6

+7

12

+2

3

)×48
183

5

×19

20

+22

5

×19

20

-19

20


411

3

×3

4

+511

4

×4

5

+611

5

×5

6


2001×1999

2000


1998÷19981998

1999


1

2

+1

6

+1

12

+1

20

+1

30

+1

42

+1

56

参考答案

(1))(56+712+23)×48
=56×48+712×48+23×48,
=40+28+32,
=100;

(2)1835×1920+225×1920-1920
=(1835+225-1)×1920
=20×1920
=19;

(3)4113×34+5114×45+6115×56
=(40+113)×34+(50+114)×45+(60+115)×56
=40×34+43×34+50×45+54×45+60×56+65×56
=30+1+40+1+50+1,
=123;

(4)2001×19992000
=(2000+1)×19992000
=2000×19992000+1×19992000
=1999+19992000
=199919992000

(5)1998÷199819981999
=19998÷1999×1998+19981999
=1998×1999(1999+1)×1998
=19992000

(6)12+16+112+120+130+142+156
=11×2+12×3+13×4+24×5+15×6+16×7+17×8
=1-12+12-13+13-14+…+17-18
=78

考点: