脱式计算方法?
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=4×4×25×125
=(125×4)×(4×25)
=1000×20
=5000
=(125×8)×(4×5)
=1000×20
=20000
=40×(100+1)
=46×100+46×1
=4600+46
=4646
=17×(1000+1)
=17×1000-17×1
=17000-17
=16983
=37x(100-1)
=37×100-37×1
=3700-37
=3663
=234x(100+2)
=234×100+2×234
=23400+468
=23868
=4×4×25×125
=(125×4)×(4×25)
=1000×20
=5000
=(125×8)×(4×5)
=1000×20
=20000
=40×(100+1)
=46×100+46×1
=4600+46
=4646
=17×(1000+1)
=17×1000-17×1
=17000-17
=16983
=37x(100-1)
=37×100-37×1
=3700-37
=3663
=234x(100+2)
=234×100+2×234
=23400+468
=23868
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