请用简便方法计算.125×17×8 ...
请用简便方法计算.125×17×899×81+8148×101-4812.7+0.98+3.02+5.35.6-1.71-0.2924.5-(7.5+4.52)...
请用简便方法计算.125×17×8 99×81+81 48×101-4812.7+0.98+3.02+5.3 5.6-1.71-0.29 24.5-(7.5+4.52)
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(1)125×17×8
=(125×8)×17
=1000×17
=17000
(2)99×81+81
=81×(99+1)
=81×100
=8100
(3)48×101-48
=48×(101-1)
=48×100
=4800
(4)12.7+0.98+3.02+5.3
=(12.7+5.3)+(0.98+3.02)
=18+4
=22
(5)5.6-1.71-0.29
=5.6-(1.71+0.29)
=5.6-2
=3.6
(6)24.5-(7.5+4.52)
=24.5-7.5-4.52
=17-4.52
=12.48
=(125×8)×17
=1000×17
=17000
(2)99×81+81
=81×(99+1)
=81×100
=8100
(3)48×101-48
=48×(101-1)
=48×100
=4800
(4)12.7+0.98+3.02+5.3
=(12.7+5.3)+(0.98+3.02)
=18+4
=22
(5)5.6-1.71-0.29
=5.6-(1.71+0.29)
=5.6-2
=3.6
(6)24.5-(7.5+4.52)
=24.5-7.5-4.52
=17-4.52
=12.48
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