2,89乘52的平方减2丶89乘48的平方
=2.89x(52²-48²)
=2.89x(52+48)x(52-48)
=2.89x100x4
=289x4
=1156
猜你喜欢
- 1The model teacher has devoted all her life to teaching her students ,and she deserves ______
- 2带有近义词的四字词语
- 3已知|m-1/2|=0,求代数式4m^2-{6m-2(3m+2)-2m^2}的值
- 4显微镜物象移动方向与装片移动方向相同还是相反
- 5甲乙分别从目的地6和10千米出发甲乙速度比3:4,甲比乙提前20分钟到,求甲,
- 6甲乙两数的平均数是16,甲数比乙数=3比5,则甲数是?乙数是?
- 7生长素对植物生长的促进作用与《 》有一定关系.生长素对《 》的影响也不一样.
- 8当水化成冰时,他的体积增加10分之1,先有一块44立方分米的冰,溶化后的体积是多
- 9从以下词语中找出四对近义词、四对反义词
- 10jim is more athletic than anr other student in his class】改为同义句