102乘45,简便运算

2024-11-23 12:28:34
推荐回答(5个)
回答1:

回答2:

102×45
=(100+2)×45
=100×45+2×45
=4500+90
=4590

回答3:

乘法分配律为:两个数的和与一个数相乘,先将它们与这个数分别相乘,再相加,积不变.即:(a+b)×c=a×c+b×c.反过来则:a×c+b×c=(a+b)×c
102 ×45
= ( 100+2)×45
= 100×45+2×45
= 4500+90
= 4590

回答4:

102×45
=100×45+2×45
=4500+90
=4590

回答5:

=(100+2)*45