19+199+1999和34+304+3004和540除以36的简便运算怎么做?

分类: 作业答案 • 2021-12-20 05:22:58

问题描述：

答

20+200+2000-3
30+300+3000+12
540/36=60/4

答

19+199+1999
=20-1+200-1+2000-1
=2220-3
=2217
34+304+3004
=30+4+300+4+3000+4
=3330+12
=3342
540/36
=(60X9)/(4X9)
=60/4
=15

答

19+199+1999
=20+200+2000-3
=2220-3
=2217
34+304+3004
=30+300+3000+4×3
=3330+12
=3342
540÷36
=540÷9÷4
=60÷4
=15