请问用简便运算怎样算101*78=

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请问用简便运算怎样算101*78=
请问用简便运算怎样算101*78=

请问用简便运算怎样算101*78=
101*78
=(100+1)*78
=100*78+1*78
=7800+78
=7878

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

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

100*78+1*78=7878

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