数学题(简便计算,1 1-2+3-4+5……+1012 498乘498-499乘4973 26.04-(4.35除以1.
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数学题(简便计算,
1 1-2+3-4+5……+101
2 498乘498-499乘497
3 26.04-(4.35除以1.5+0.9)乘4.2
4 3.01-0.25乘0.4除以0.25乘0.4
1 1-2+3-4+5……+101
2 498乘498-499乘497
3 26.04-(4.35除以1.5+0.9)乘4.2
4 3.01-0.25乘0.4除以0.25乘0.4
1:
=(1-2)+(3-4)+(5-6).+(99-100)+101
=-1 -1 -1...-1+101
=51
2:
498*498-499*497
=498*498-(498+1)*(498-1)
=498*498-498*498+498-498+1
=1
3:
=26.04-(2.9+0.9)*4.2
=26.04-(4.0-0.2)*(4.0+0.2)
=26.4-16+0.04
=10
4:
=3.01-0.25/0.25*0.4*0.4
=3.01-0.16
=2.85
=(1-2)+(3-4)+(5-6).+(99-100)+101
=-1 -1 -1...-1+101
=51
2:
498*498-499*497
=498*498-(498+1)*(498-1)
=498*498-498*498+498-498+1
=1
3:
=26.04-(2.9+0.9)*4.2
=26.04-(4.0-0.2)*(4.0+0.2)
=26.4-16+0.04
=10
4:
=3.01-0.25/0.25*0.4*0.4
=3.01-0.16
=2.85
数学题(简便计算,1 1-2+3-4+5……+1012 498乘498-499乘4973 26.04-(4.35除以1.
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