用简便运算计算20.05乘1.92加2.005乘80.2

问题描述:

用简便运算计算20.05乘1.92加2.005乘80.2

20.05×19.2+2.005×80.2
=20.05×19.2+20.05×8.02
=20.5×(19.2+8.02)
=20.5×27.22
=558.01答案不对20.05×1.92+2.005×80.2
=20.05×1.92+20.05×8.02
=20.5×(1.92+8.02)
=20.5×9.94
=203.77刚看错一个数我终于算对了,谢谢您答案是199.29720.05你写成20.5了呵,不好意思,刚要一边弄粥给小孩吃客气噢!谢谢你!有算式就可以了