Question

急急急！几道小学数学计算题（能简便的要简便！！）每一步都得写的清清楚楚！会的先写！！！

9999×7778+3333×6666 5.6×69.32﹢138.64×0.05﹢693.2×0.43
999×1999 （十五分之七＋十七分之二）×15×17

Answer 1

1.=3333*3*7778+3333*3*2222
=9999*（7778+2222）尘渗
=99990000
2.=5.6*69.32+69.32*2*0.05+69.32*4.3
=69.32*（5.6+0.1+4.3）派磨脊
=693.2
3.=(1000-1)*(2000-1)
=2000000-3000-1
=1996999
4.=(7/15+2/17)*15*17
=7/15*15*17+2/17*15*17
=7*17+2*15
=149
希望游衡对你有帮助。

Answer 2

不郑雹好意喊答帆思，只想了一举和个
9999×7778+3333×6666=1111×9 ×(7778+2×1111) =1111×9×10000=99990000

Answer 3

999*1999=(1000-1)*1999=1000*1999-1999=1999000-1999=1997001
(7/15+2/17)*15*17=7/局祥早15*15*17+2/桐雀宴肢17*15*17=7*17+2*15=119+30=149