45×(100-8)用简便方法计算

2025-06-20 14:22:47
推荐回答(4个)
回答1:

45×(100-8)
=45×100-45×8
=4500-360
=4140

回答2:

原式=45(100-10+2)=4500-450+90=4000+500-450+90=4000+50+90=4000+140=4140

回答3:

45(100-8) =45×100-45×8 =4500-350 =4140

回答4:

45×(100-8)
=45x100-45x(2x4)
=4500-45x2x4
=4500-90x4
=4500-360
=4140