递等式计算(能简便的用简便方法计算).99×38125×565500÷125 &nb...
递等式计算(能简便的用简便方法计算).99×38125×565500÷125345+655×240478-156-144899-(253+299)[400-(678+31...
递等式计算(能简便的用简便方法计算).99×38125×565500÷125 345+655×240478-156-144 899-(253+299)[400-(678+312)÷330]×2509800÷(25×49)48400÷25÷4 8400÷(21×74+26×21)
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(1)99×38
=(100-1)×38
=100×38-1×38
=3800-38
=3762;
(2)125×56
=125×8×7
=1000×7
=7000;
(3)5500÷125
=5500÷(5×5×5)
=5500÷5÷5÷5
=1100÷5÷5
=220÷5
=44;
(4)345+655×240
=345+157200
=157545;
(5)478-156-144
=478-(156+144)
=478-300
=178;
(6)899-(253+299)
=899-299-253
=600-253
=347;
(7)[400-(678+312)÷330]×250
=[400-990÷330]×250
=[400-3]×250
=400×250-3×250
=100000-750
=99250;
(8)9800÷(25×49)
=9800÷49÷25
=200÷25
=8;
(9)48400÷25÷4
=48400÷(25×4)
=48400÷100
=484;
(10)8400÷(21×74+26×21)
=8400÷[21×(74+26)]
=8400÷(21×100)
=8400÷2100
=4.
=(100-1)×38
=100×38-1×38
=3800-38
=3762;
(2)125×56
=125×8×7
=1000×7
=7000;
(3)5500÷125
=5500÷(5×5×5)
=5500÷5÷5÷5
=1100÷5÷5
=220÷5
=44;
(4)345+655×240
=345+157200
=157545;
(5)478-156-144
=478-(156+144)
=478-300
=178;
(6)899-(253+299)
=899-299-253
=600-253
=347;
(7)[400-(678+312)÷330]×250
=[400-990÷330]×250
=[400-3]×250
=400×250-3×250
=100000-750
=99250;
(8)9800÷(25×49)
=9800÷49÷25
=200÷25
=8;
(9)48400÷25÷4
=48400÷(25×4)
=48400÷100
=484;
(10)8400÷(21×74+26×21)
=8400÷[21×(74+26)]
=8400÷(21×100)
=8400÷2100
=4.
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