如题所述
第1个回答 2020-03-09
解:902-98等于( 804 )
∵已知需求出902-98等于多少
X - Y = Z
∴902 - 98
= (900 + 2)- (100 - 2)
= 900 + 2 - 100 + 2
= (900 - 100)+(2 + 2)
= 800 + 4
= 804
答:902-98等于804本回答被网友采纳
∵已知需求出902-98等于多少
X - Y = Z
∴902 - 98
= (900 + 2)- (100 - 2)
= 900 + 2 - 100 + 2
= (900 - 100)+(2 + 2)
= 800 + 4
= 804
答:902-98等于804本回答被网友采纳
第2个回答 2020-03-09
=902-100+2
=802+2
=804
=802+2
=804