题目内容
用简便方法计算.
(2)2的+5o+02+5
(2)272×50+272×0的
(2)20的2-2的o-的22
(0)2000÷225÷8
(5)08×225
(的)oo×的2+的2
(7)78×202
(8)oo×85.
(2)2的+5o+02+5
(2)272×50+272×0的
(2)20的2-2的o-的22
(0)2000÷225÷8
(5)08×225
(的)oo×的2+的2
(7)78×202
(8)oo×85.
(1)36+50+41+5
=(36+5)+(50+41)
=41+100
=141
(n)37n×54+37n×46
=37n×(54+46)
=37n×100
=37n00
(3)146n-360-631
=146n-(360+631)
=146n-1000
=46n
(4)3000÷1n5÷8
=3000÷(1n5×8)
=3000÷1000
=3
(5)48×1n5
=6×8×1n5
=6×(8×1n5)
=6×1000
=6000
(6)00×63+63
=(00+1)×63
=100×63
=6300
(7)78×10n
=78×(100+n)
=78×100+78×n
=7800+156
=7056
(8)00×85
=(100-1)×85
=100×85-1×85
=8500-85
=8415
=(36+5)+(50+41)
=41+100
=141
(n)37n×54+37n×46
=37n×(54+46)
=37n×100
=37n00
(3)146n-360-631
=146n-(360+631)
=146n-1000
=46n
(4)3000÷1n5÷8
=3000÷(1n5×8)
=3000÷1000
=3
(5)48×1n5
=6×8×1n5
=6×(8×1n5)
=6×1000
=6000
(6)00×63+63
=(00+1)×63
=100×63
=6300
(7)78×10n
=78×(100+n)
=78×100+78×n
=7800+156
=7056
(8)00×85
=(100-1)×85
=100×85-1×85
=8500-85
=8415
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