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3.51×49+35.1×5.1+49×51

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/06/01 00:15:02
3.51×49+35.1×5.1+49×51
66666×6+88888×8
2772÷28+34965÷35
2006×2007×20082008-2006×2008×20072007.
(1)3.51×49+35.1×5.1+49×51,
=3.51×49+3.51×51+49×51,
=3.51×(49+51)+49×51,
=3.51×100+49×51,
=351+2499,
=2850;
(2)66666×6+88888×8,
=11111×36+11111×64,
=11111×(36+64),
=11111×100,
=1111100;
(3)2772÷28+34965÷35,
=(2800-28)÷28+(35000-35)÷35,
=2800÷28-28÷28+35000÷35-35÷35,
=100-1+1000-1,
=1100-2,
=1098;
(4)2006×2007×20082008-2006×2008×20072007,
=2006×2007×2008×10001-2006×2008×1007×10001,
=0.