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1 / 4 + 1 / 28 + 1 / 70 + 1 / 130 = how much? It's urgent. Please It's easy to calculate
1 / 4 + 1 / 28 + 1 / 70 + 1 / 130
=1/3×（1-1/4+1/4-1/7+1/7-1/10+1/10-1/13）
=1/3×12/13
=4/13
Simple algorithm 2772 △ 28 + 31535 △ 35=
Must be can't use computer?
28 x 100 = 2800 - 28 = 2772 ---->99
31500 + 35 = 31500/35 +35/35 ---->900 +1
99 + 900 +1 = 1000!
Skillfully calculating 2772 / 28 + 34965 / 35
suan shi
2772/28+34965/35
=（2800-28）/28+（35000-35）/35
=100-1+1000-1
=1100-2
=1098
2772÷28+34965÷35．
2772÷28+34965÷35，=99+999，=（100-1）+（1000-1），=1100-2，=1098．
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