810×0.125-1.25怎么算?
2020-06-22 · 知道合伙人教育行家
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800×0.125+(10×0.125-1.25)
=800×0.125+(1.25-1.25)
=800×0.125+0
=100+0
=100
=800×0.125+(1.25-1.25)
=800×0.125+0
=100+0
=100
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怎样简便怎样算.0.81×99+0.810.25×(85+85+85+85)0.125×32×0.2582.2×9.9. 试题难度:难度:中档 试题类型:解答题 试题内容:怎样简便怎样算.0.81×99+0.810.25×(85+85+85+85)0.125×32×0.2582.2×9.9. 试题答案:(1)0.81×99+0.81,=0.81×(99+1),=0.81×100,=81;(2)0.25×(85+85+85+85),=0.25×(85×4),=0.25×4×85,=1×85,=85;(3)0.125×32×0.25,=0.125×8×4×0.25,=(0.125×8)×(4×0.25),=1×1,=1;(4)82.2×9.9,=82.2×(10-0.1),=82.2×10-82.2×0.1,=822-8.22,=813.78.
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1.25=10x0.125 810x0.125-1.25=810x0.125-10x0.125=800x0.125=100
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试题答案:(1)0.81×99+0.81,
=0.81×(99+1),
=0.81×100,
=81;
(2)0.25×(85+85+85+85),
=0.25×(85×4),
=0.25×4×85,
=1×85,
=85;
(3)0.125×32×0.25,
=0.125×8×4×0.25,
=(0.125×8)×(4×0.25),
=1×1,
=1;
(4)82.2×9.9,
=82.2×(10-0.1),
=82.2×10-82.2×0.1,
=822-8.22,
=813.78.
=0.81×(99+1),
=0.81×100,
=81;
(2)0.25×(85+85+85+85),
=0.25×(85×4),
=0.25×4×85,
=1×85,
=85;
(3)0.125×32×0.25,
=0.125×8×4×0.25,
=(0.125×8)×(4×0.25),
=1×1,
=1;
(4)82.2×9.9,
=82.2×(10-0.1),
=82.2×10-82.2×0.1,
=822-8.22,
=813.78.
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试题答案:(1)0.81×99+0.81,
=0.81×(99+1),
=0.81×100,
=81;
(2)0.25×(85+85+85+85),
=0.25×(85×4),
=0.25×4×85,
=1×85,
=85;
(3)0.125×32×0.25,
=0.125×8×4×0.25,
=(0.125×8)×(4×0.25),
=1×1,
=1;
(4)82.2×9.9,
=82.2×(10-0.1),
=82.2×10-82.2×0.1,
=822-8.22,
=813.78.
=0.81×(99+1),
=0.81×100,
=81;
(2)0.25×(85+85+85+85),
=0.25×(85×4),
=0.25×4×85,
=1×85,
=85;
(3)0.125×32×0.25,
=0.125×8×4×0.25,
=(0.125×8)×(4×0.25),
=1×1,
=1;
(4)82.2×9.9,
=82.2×(10-0.1),
=82.2×10-82.2×0.1,
=822-8.22,
=813.78.
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