请问用简便运算怎样算101*78=

分类: 作业答案 • 2021-12-19 11:33:31

问题描述：

请问用简便运算怎样算101*78=

答

101*78=(100+1)*78
=100*78+1*78
=7878

答

100*78+1*78=7878

答

12/X-1=15/2X
两边乘60
5X-5=8X
8X-5X=-5
3X=-5
X=-5/3
5/Y+17-4/3Y-7=-2
两边乘20
4(Y+17)-5(3Y-7)=-40
4Y+68-15Y+35=-40
11Y=143
Y=143÷11
Y=13

答

=(100+1)*78
=10*78+1*78
=7800+78
=7878

答

101*78
=(100+1)*78
=100*78+1*78
=7800+78
=7878