亚洲激情+欧美激情,无码任你躁久久久久久,我的极品美女老婆,性欧美牲交在线视频,亚洲av高清在线一区二区三区

^{}

電子課本網(wǎng) › 第70頁(yè)

第70頁(yè)

信息發(fā)布者：

$a$

$b$

$a$

$-$

$b$

$\div$

$c$

=(636+84)÷3

=720÷3

=240

=4500÷45?90÷45

=100?2

=98

?$120\div 3 + 120\div 5 = 64$?

?$120\div (3 + 5) = 15$?

?$64\neq 15，$?所以?$a\div b + a\div c=a\div (b + c)$?不

正確。

=2222×4+2222×4×19

=2222× (4+4×19)

=2222×80

=177760

=72×85+38×85?85×10

=85×(72+38?10)

=85×100

=8500

=51×102×78÷17÷34÷13 

=(51÷17)×(102÷34)×(78÷13) 

=3×3×6 

=54

=(1000+999?998?997)+(996+995?994?993)+

...+(4+3?2?1)

=4+4+...+4

=4×250

=1000

=2025×2026×(10001?10001)

=0

$7$

$62$

$220$

$45$