300-[300×[1/4]+(300-300×[1/4])×[2/5]]
=300-[75+(300-75)×[2/5]]
=300-[75+225×[2/5]]
=300-[75+90]
=300-165
=135(页)
答:第三天看了135页.
300-[300×[1/4]+(300-300×[1/4])×[2/5]]
=300-[75+(300-75)×[2/5]]
=300-[75+225×[2/5]]
=300-[75+90]
=300-165
=135(页)
答:第三天看了135页.