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计算:(要求写出计算过程)(1)5114×45+6115×56+7116×67(2)1-12
问题详情
计算:(要求写出计算过程) (1)5114×45+6115×56+7116×67,
(1)511 4× 4 5+61 1 5× 5 6+71 1 6× 6 7
(2)1-1 2×{1- 1 3×[1- 1 4×(1- 1 5)]}
(3)[1-(1 12+ 1 15)×4]÷( 3 10÷ 9 25)
(4)2008×11 2÷1 1 3-100 2 5÷ 1 20.
参考答案
=(50+54)×45+(60+65)×56+(70+76)×67,
=(40+1)+(50+1)+(60+1),
=150+3,
=153;
(2)1-12×{1-13×[1-14×(1-15)]},
=1-12×{1-13×[1-14×45]},
=1-12×{1-13×[1-15]},
=1-12×{1-13×45},
=1-12×{1-415},
=1-12×1115,
=1-1130,
=1930;
(3)[1-(112+115)×4]÷(310÷925),
=[1-320×4]÷(310×259),
=[1-35]÷56,
=25×65,
=1225;
(4)2008×112÷113-10025÷120,
=2008×32×34-5025×20,
=2008×32×34-2008,
=2008×(32×34-1)
=2008×18,
=251.考点:过程