0.125×9.3×80计算下列各题能简算的要简算
计算下列各题,能简算的要简算.50×0.125×0.02×80.8×(4-3.75)×9.90.81×99+0.8125×(85+85+85+85)...
计算下列各题,能简算的要简算.
50×0.125×0.02×8 0.8×(4-3.75)×9.9 0.81×99+0.81 25×(85+85+85+85) 展开
50×0.125×0.02×8 0.8×(4-3.75)×9.9 0.81×99+0.81 25×(85+85+85+85) 展开
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(1).50×0.125×0.02×8,
=(50×0.02)×(0.125×8),
=1×1,
=1;
(2).0.8×(4-3.75)×9.9,
=0.8×0.25×9.9,
=0.2×9.9,
=0.2×(10-0.1),
=0.2×10-0.2×0.1,
=2-0.02,
=1.98;
(3)0.81×99+0.81,
=0.81×99+0.81×1,
=0.81×(99+1),
=0.81×100,
=81;
(4)25×(85+85+85+85),
=25×4×85,
=100×85,
=8500.
=(50×0.02)×(0.125×8),
=1×1,
=1;
(2).0.8×(4-3.75)×9.9,
=0.8×0.25×9.9,
=0.2×9.9,
=0.2×(10-0.1),
=0.2×10-0.2×0.1,
=2-0.02,
=1.98;
(3)0.81×99+0.81,
=0.81×99+0.81×1,
=0.81×(99+1),
=0.81×100,
=81;
(4)25×(85+85+85+85),
=25×4×85,
=100×85,
=8500.
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