-0.875-(-1又1\4)+3\4+1又7\8 [2.4-(-2.7+3.5)-2.2]-(-6.7+5.4)
问题描述:
-0.875-(-1又1\4)+3\4+1又7\8 [2.4-(-2.7+3.5)-2.2]-(-6.7+5.4)
答
-0.875-(-1又1\4)+3\4+1又7\8
=(1又7/8-7/8)-(1又1/4-3/4)
=1-1/2
=1/2
[2.4-(-2.7+3.5)-2.2]-(-6.7+5.4)
=2.4+2.7-3.5-2.2+6.7-5.4
=5.1-5.7+6.7-5.4
=6.1-5.4
=0.7