50+50=100 500+5000=5500 50000000000+987687987.0987657890-789+98=?用简便方法计算
问题描述:
50+50=100 500+5000=5500 50000000000+987687987.0987657890-789+98=?用简便方法计算
答
用死算,只要不算死就行了.此题只用算出50000000000+的后面部分就可以了.
987687987.0987657890-789+98
=987687987.0987657890-(789-98)
=987687987.0987657890-691(不用考虑小数部分,直接用整数部分相减)
=987687296.098765789
最后加上50000000000等于50987687296.098765789