帮我出几道六年级下的简算.要简单一点的.
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帮我出几道六年级下的简算.要简单一点的.
帮我出几道六年级下的简算.
要简单一点的.
帮我出几道六年级下的简算.要简单一点的.
1、0.2008+2.008+20.08+200.8+2008
=0.2008×(1+10+100+1000+10000)
=0.2008×11110
=2230.888
2、1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6)÷……÷(2007÷2008)
=1×3/2×4/3×5/4×6/5×……×2008/2007
=2008
3、1+1/3+1/6+1/10+……+1/2009×1004
=2×(1/2+1/6+1/12+1/20+……+1/2008×2009)
=2×(1-1/2+1/2-1/3+1/3-1/4+……+1/2008-1/2009)
=2×(1-1/2009)
=2×2008/2009
=4016/2009
4、325.24+425.24+625.24+925.24+525.24
=(300+400+600+900+500)+25.24×5
=2700+126.2
=2826.2
5、1/1×4+1/4×7+1/7×10+1/10×13+……+1/2005×2008
=(1-1/4+1/4-1/7+1/7-1/10+1/10-1/13+……+1/2005-1/2008)÷3
=(1-1/2008)÷3
=2007/2008÷3
=669/2008
9999x7778+3333x6666
=9999x7778+9999x2222
=9999x(7778+2222)
=9999x10000
=99990000
(1)888+999
(2)58-92+42-8
(3)(88*125+125*12)*8
(4)816-2304/72+8*3
(5)3306*51/7
(6)659-348/2
(7)13-(2.65+3/7)
(8)12*28/7
(9)(7/10)/3+(3/10)/(1/3)
(10)0.007+0.993X4X5X...
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(1)888+999
(2)58-92+42-8
(3)(88*125+125*12)*8
(4)816-2304/72+8*3
(5)3306*51/7
(6)659-348/2
(7)13-(2.65+3/7)
(8)12*28/7
(9)(7/10)/3+(3/10)/(1/3)
(10)0.007+0.993X4X5X1.8
(11)(522+643*521)/(522*643-121)
(12)341*99+314*1
(13)0.56+0.4
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