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刁飞命3690六年级下数学
周削剑15363699978 ______ 由题意,这道题关键是在前面一个式子中,找出相乘是10的倍数的数 因为-2*5=-10,-4*15=-60,-8*25=-200,-10*20*30=-6000 以上算式的结果相乘,一共有7个0 所以末尾有7个0

刁飞命3690六年级下册数学
周削剑15363699978 ______ 解设一袋x. 7x-3x=16*7 4x=112 x=28

刁飞命3690小学6年级数学下册
周削剑15363699978 ______ 因为,顺水速度=船速+水流速度,逆水速度=船速-水流速度由题知,2*水流速度=20千米/每小时水流速度=10千米/每小时设,两港距离为x千米,船速为a千米每小时则甲到乙所用时间为,x/(a+10)乙返回甲所用时间为,x/(a-10)由题知x/(a+10)+x/(a-10)=8 (1)式后四个小时的行驶距离为4(a-10)前四个小时的行驶距离为4(a-10)+60=x+(a-10)[4-x/(a+10)] (2)式求解(1)式和(2)式得a=40千米/每小时,x=150千米即两港距离为150千米.

刁飞命3690小学数学6年级下册
周削剑15363699978 ______ 现在每天烧3-0.6=2.4吨 设现在这堆煤可以烧x天 96 2.4 --- = ----- X 3 x=120

刁飞命3690六年级下数学
周削剑15363699978 ______ 一千米消耗的油量为 15/200=0.075 L 1500千米消耗 1500*0.075=112.5L

刁飞命3690小学六年级数学下册
周削剑15363699978 ______ 1/3*∏*9^2*h=∏*6^2*(4/5h-105) 27h=28.8h-3780 H=3780/1.8=2100厘米(这是容器的高) 圆柱形容器的水深为: 4/5h-105=1575厘米

刁飞命3690数学六年级下册
周削剑15363699978 ______ 周长31.4厘米 底面积25π≈78.5平方厘米 表面积308.2平方厘米

刁飞命3690六年级下册数学
周削剑15363699978 ______ 1、叔叔与玉棼的年龄差:10*(5-1)=40岁 40÷(3-1)-10=10岁 再过10年叔叔的年龄正好是玉棼的3倍. 2、400÷4-43=57千米 客车每小时行57千米.

刁飞命3690小学6年级下册数学
周削剑15363699978 ______ 解:设体积是x 50.24:(2²*3.14)=x:【(4÷2)²*3.14】 12.56x=50.24*12.56 x=50.24 答:体积是多少50.24立方分米.

刁飞命3690六年级(下)数学
周削剑15363699978 ______ 解:一:25.12÷3.14÷2=4(dm) 4*4*3.14=50.24(dm2) 50.24*3=150.72(dm2) 二:(20+10)*4+18=138(cm) 20*3.14*10+(20÷2)*(20÷2)*3.14*2=1256(cm2) (20÷2)*(20÷2)*3.14*10=3140(cm3)