-1-{(-3)²-[3+0.4×(-1又½)]÷(-2)}的得数等于多少

显示全部楼层 · 2012-10-12 13:06:31

-1-{(-3)2-[3+0.4×(-1又?)]÷(-2)}= -1 - [9 - (3 - 0.4 x 1.5) ÷ (-2) ]= -1 - (9 + 2.4 ÷2)= -1 - (9 + 1.2)= -1 - 10.2= -11.2...

千问 · 2012-10-12 13:06:31

-1-{(-3)2-[3+0.4×(-1又?)]÷(-2)}=-1-[9-(3-0.6)÷（-2）]=-1-(9+1.2）=-1-10.2=-11.2 如有不明白，可以追问如有帮助，记得采纳，谢谢...

千问 · 2012-10-12 13:06:31

=-1-{9-[3-0.6]÷(-2)}=-1-[(9-2.4)÷(-2)]=-1-(-6.6÷2)=-1-(-3.3)=-1+3.3=2.3...