初一数学题对答案谢谢1.(-25)+13+|-7|―(-5);2.18-21÷(-7)×(-1/3);3.-3/4×(-8+1/3-1/2);4.-1的四次方-1/6×{2-(-3)²}
问题描述:
初一数学题对答案谢谢
1.(-25)+13+|-7|―(-5);2.18-21÷(-7)×(-1/3);3.-3/4×(-8+1/3-1/2);4.-1的四次方-1/6×{2-(-3)²}
答
1,0 2,17
答
0
17
10.5
-1/6
答
(1) -25+13-7+5=-25-7+13+5=-32+18=-14(2) 18-21×(-1/7)×(-1/3)=18+3×(-1/3)=18-1=17(3)-3/4×(-8+2/6-3/6)=-3/4×(-8-1/6)=-3/4×(-48/6-1/6)=-3/4×(-49/6)=49/8(4)(-1)^4-1/6×(2-9)=1-1...
答
1. =(-25)+13+7+5 2.=18-(-3+×(-1/3)
=-12+7+5 =18-1
=10 =17
3.=6+(-4)+3/8 4.=1-1/6×(-7)
=46/8+3/8 =1+7/6
=49/8 =2又 1/6