六年级数学简便计算难题

六年级数学简便计算难题5、（1＋＋＋）×（＋＋＋）－（1＋＋＋＋）×（＋＋）1、2、3、（4）解方程：3.6：（）=1.2：0.5（1）（2）解方程：（3）（4）（1）（2）解方程：（3）（4）（1）[-EMBEDEquation.3（+）]EMBEDEquation.3(2)解方程：40%：（3x）=:0.6(3)-101(4)EMBEDEquation.31.2-++（1）（2）999.8×98+（-0.6）×9998（3）（4）解方程：1、246×2、(++++)÷(++++)3、2004×4＋97×20044、1+2+3+4+……+99+100+99+……+4+3+2+1_1234567902.unknown_1234567903.unknown_1234567904.unknown_1234567905.unknown_1234567906.unknown_1234567907.unknown_1234567908.unknown_1234567909.unknown_1234567910.unknown_1234567911.unknown_1234567912.unknown_1234567913.unknown_1234567914.unknown_1234567915.unknown_1234567916.unknown_1234567917.unknown_1234567918.unknown_1234567919.unknown_1234567920.unknown_1234567921.unknown_1234567922.unknown_1234567923.unknown_1234567924.unknown_1234567925.unknown_1234567926.unknown_1234567927.unknown_1234567928.unknown_1234567929.unknown_1234567930.unknown_1234567931.unknown_1234567932.unknown_1234567933.unknown_1234567934.unknown_1234567935.unknown_1234567936.unknown_1234567937.unknown_1234567938.unknown_1234567939.unknown_1234567940.unknown_1234567941.unknown_1234567942.unknown_1234567943.unknown_1234567944.unknown_1234567945.unknown_1234567946.unknown_1234567947.unknown_1234567948.unknown_1234567949.unknown_1234567950.unknown_1234567951.unknown_1234567952.unknown_1234567953.unknown_1234567954.unknown_1234567955.unknown_1234567956.unknown_1234567957.unknown