早教吧 育儿知识 作业答案 考试题库 百科 知识分享

1.234²+0.766²+2.468×0.766-3.35²+0.75²

题目详情
1.234²+0.766²+2.468×0.766-3.35²+0.75²
▼优质解答
答案和解析
1.234²+0.766²+2.468×0.766-3.35²+0.75²
=1.234²+0.766²+2x1.234×0.766-3.35²+0.75²
=(1.234+0.766)^2+0.75²-3.35²
=4+(0.75+3.35)(0.75-3.35)
=4+4x(-2.6)
=-4*1.6
=-6.4
请选为满意答案