小学数学题目(求简算)

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小学数学题目(求简算)小学数学题目(求简算)小学数学题目(求简算)1×6+2×9+3×12+……+19×60=3×(1×2+2×3+3×4+……+19×20)=3*[(1+2+3+4+.+19)+(1

小学数学题目(求简算)
小学数学题目(求简算)

小学数学题目(求简算)
1×6+2×9+3×12+……+19×60
=
3×(1×2+2×3+3×4+……+19×20)
=3*[(1+2+3+4+.+19)+(1*1+2*2+3*3+.19*19)]
=3*(190+19*20*39/6)
=57*(10+130)
=7980.
平方和公式:n(n+1)(2n+1)/6
[(1.4+1/2)÷10.4-1/6]X72%
=(13/5÷42/5-1/6)*0.72
=(13/42-1/6)*0.72
=5/42*23/25
=13/210

1+1=?
1+1在什么情况下等3
3*3+3+3=?

1+2+3+4+……+100=?

2.2+3+0.72 7.7+2+9.1 1.5+5+2 7+0.1+0.15
1+6+2.7 8.3+2.2+2.8 8+2.5+1.2 5+0.3+1.8
5.8-4.8-0.2 2-1.2-0.5 8-3.7-2.5 5.5...

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2.2+3+0.72 7.7+2+9.1 1.5+5+2 7+0.1+0.15
1+6+2.7 8.3+2.2+2.8 8+2.5+1.2 5+0.3+1.8
5.8-4.8-0.2 2-1.2-0.5 8-3.7-2.5 5.5-2.8-2.7
6.8-5.7-0.3 7.9-5.4-2 4.5-2.1-1.9 9-2.5-1.2
2.3-1.5+5.6 5-3.2+8.5 1.5-0.1+6 8-2.2+6.2
5.6-4.4+3 1.9-0.8+5 8.7-5.4+7 3.5-2.9+9
6×3.5+6.4 8×2.8+3 2×3.9+2 5.3×5+1
5.6+2.5×2 1.1+6×6.5 6×9.2+3 6.4+7×3
158+262+138 375+219+381+225
5001-247-1021-232 181+2564+2719
378+44+114+242+222 276+228+353+219
(375+1034)+(966+125) (2130+783+270)+1017
99+999+9999+99999 7755-(2187+755)
2214+638+286 3065-738-1065
2357-183-317-357 2365-1086-214+497-299
25×32×125 178×101-178 84×36+64×84

75×99+2×75 83×102-83×2 25×(24+16)
2356-(1356-721) 1235-(1780-1665)

75×27+19×25 31×870+13×310 50×(34×4)×3
4×(25×65+25×28) 123×18-123×3+85×123
123×43-43×23 175-75÷25 2800÷ 100+789
47.83-(6.83+13.5) (947-599)+76×64
57.26-(5.26-1.5) 106.25+3.85-2.125+3.875
11.9-2456×21 13.375+5.75+2.25+6.625
(15.1-9036)÷18 163.8×5.25+14.5
172.1×4.3+5.7×2.1 19.102×45-328
23÷(50-12.5) ÷2.5 25.6÷110×47+639
3.375×0.97+0.97×6.625 6.54+2.4+3.46+0.6
95.6×1.8+95.6×8.2 35.6-420÷12×4
5000-105×34 0.15÷0.25+0.75×1.2
42×(25+4)×4 3×63÷21-84
403÷13×27 46.1.5×4.2-0.75÷0.25
3.27×4 +3.27×5.7 0.25×80-0.45÷0.9
6756-193-207 97×360+3×360

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