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
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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