1.45+(-30)2.-1/4-(-1/2)3.-40-25-(-19)+(-24)4.31+(-3/4)-(-1/6)+5/45.(-0.1)÷1/2吃(-100)6.(-24)÷[(-2)³-(-4)]7.(-60)×(3/4+5/6)8.-3²×1.2²÷0.3³-(-1/3)²×(-3)²
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/14 18:43:28
![1.45+(-30)2.-1/4-(-1/2)3.-40-25-(-19)+(-24)4.31+(-3/4)-(-1/6)+5/45.(-0.1)÷1/2吃(-100)6.(-24)÷[(-2)³-(-4)]7.(-60)×(3/4+5/6)8.-3²×1.2²÷0.3³-(-1/3)²×(-3)²](/uploads/image/z/12061305-9-5.jpg?t=1.45%2B%EF%BC%88-30%EF%BC%892.-1%2F4-%EF%BC%88-1%2F2%EF%BC%893.-40-25-%EF%BC%88-19%EF%BC%89%2B%EF%BC%88-24%EF%BC%894.31%2B%EF%BC%88-3%2F4%EF%BC%89-%EF%BC%88-1%2F6%EF%BC%89%2B5%2F45.%EF%BC%88-0.1%EF%BC%89%C3%B71%2F2%E5%90%83%EF%BC%88-100%EF%BC%896.%EF%BC%88-24%EF%BC%89%C3%B7%5B%EF%BC%88-2%EF%BC%89%26%23179%3B-%EF%BC%88-4%EF%BC%89%5D7.%EF%BC%88-60%EF%BC%89%C3%97%EF%BC%883%2F4%2B5%2F6%EF%BC%898.-3%26%23178%3B%C3%971.2%26%23178%3B%C3%B70.3%26%23179%3B-%EF%BC%88-1%2F3%EF%BC%89%26%23178%3B%C3%97%EF%BC%88-3%EF%BC%89%26%23178%3B)
1.45+(-30)2.-1/4-(-1/2)3.-40-25-(-19)+(-24)4.31+(-3/4)-(-1/6)+5/45.(-0.1)÷1/2吃(-100)6.(-24)÷[(-2)³-(-4)]7.(-60)×(3/4+5/6)8.-3²×1.2²÷0.3³-(-1/3)²×(-3)²
1.45+(-30)
2.-1/4-(-1/2)
3.-40-25-(-19)+(-24)
4.31+(-3/4)-(-1/6)+5/4
5.(-0.1)÷1/2吃(-100)
6.(-24)÷[(-2)³-(-4)]
7.(-60)×(3/4+5/6)
8.-3²×1.2²÷0.3³-(-1/3)²×(-3)²
某中学男子排球队12名队员的身高(单位:m)分别为:1.73,1.74,1.80,1.77,1.80,1.75,1.77,1.72,1.74,1.79,1.81,1.76.求队员的平均身高.(不要全加起来再除的方法.)
答的好的话+分
1.45+(-30)2.-1/4-(-1/2)3.-40-25-(-19)+(-24)4.31+(-3/4)-(-1/6)+5/45.(-0.1)÷1/2吃(-100)6.(-24)÷[(-2)³-(-4)]7.(-60)×(3/4+5/6)8.-3²×1.2²÷0.3³-(-1/3)²×(-3)²
1.45+(-30)
=45-30
=15,
2.-1/4-(-1/2)
=﹣1/4+1/2
=1/4,
3.-40-25-(-19)+(-24)=
﹣40-25+19-24
=﹣70,
4.31+(-3/4)-(-1/6)+5/4
=31+5/4-3/4+1/6
=95/3,
5.(-0.1)÷1/2×(-100)
=﹣1/5×(-100)
=20,
6.(-24)÷[(-2)³-(-4)]
=(-24)÷(-8+4﹚
=(-24)÷(-4﹚
=6,
7.(-60)×(3/4+5/6)
=(-60)×19/12
=﹣95,
8..-3²×1.2²÷0.3³-(-1/3)²×(-3)²
=﹣9×1.44÷0.027-1/9×9
=﹣480-1
=﹣481
1.80为基数.
(-0.07-00.6-0.03-0.05-0.03-0.08-0.06-0.01+0.01-0.04)/12
=-0.42/12
=-0.035m
1.80-0.035=1.765m