(+8又十分之七)÷(-14)-(5又十分之三)÷(-14) 0.75+五分之一÷(-五分之四)-五分之二×(-四分之五)

问题描述:

(+8又十分之七)÷(-14)-(5又十分之三)÷(-14) 0.75+五分之一÷(-五分之四)-五分之二×(-四分之五)

(+8又十分之七)÷(-14)-(5又十分之三)÷(-14)
=(8+7/10)÷(-14)-(5+3/10)÷(-14)
=[(8+7/10) -(5+3/10)]÷(-14)
=(8+7/10 -5 -3/10)÷(-14)
=(3 + 4/10)÷(-14)
= 17/5 ÷(-14)
= -17/70
0.75+五分之一÷(-五分之四)-五分之二×(-四分之五)
= 3/4 +1/5÷(-4/5)-2/5×(-5/4)
=3/4 +1/5×(-5/4)-2/5×(-5/4)
=3/4 +(1/5 - 2/5)×(-5/4)
=3/4 +(-1/5)×(-5/4)
=3/4 +1/4
= 1