68-7.5+32-2.5 7.8*10.1

问题描述:

68-7.5+32-2.5
7.8*10.1

68-7.5+32-2.5
=68+32-7.5-2.5
=(68+32)-(7.5+2.5)
=100-10
=90

68-7.5+32-2.5=(68+32)-(7.5+2.5)=90
7.8*10.1=7.8*(10+0.1)=(7.8*10)+(7.8*0.1)=78+0.78=78.78

按计算机或电脑

68-7.5+32-2.5
=68+32-7.5-2.5
=(68+32)-(7.5+2.5)
=100-10
=90
7.8*10.1
=78.78

1.=68+32-(7.5+2.5)
=100-10
=90
2.确实不知道 好丢人

68+32-(7.5+2.5)=90
7.8*(10+0.1)=78+0.78=78.78

(68+32)-(7.5+2.5)
=100-10
=90
7.8*(10+0.1.)
=7.8*10+7.8*0.1
=78+0.78
=78.78

68-7.5+32-2.5
=68-[7.5+2.5]+32
=68+32-10
=100-10
=90
7.8*10.1
=7.8×[10+0.1]
=7.8×10+7.8×0.1
=78+0.78
=78.78
希望可以给你帮助

第一个 90
第二个 78.78