谁可以发一下这三道的简便算法
展开全部
199.9x19.98-199.8x19.97
=199.9x19.98-19.98x10x19.97
=199.9x19.98-19.98x199.7
=(199.9-199.7)x199.8
=0.2x199.8
=39.96
7777x5-9999x7+2222
=1111x7x5-1111x9x7+2x1111
=1111x35-1111x63+2x1111
=1111x(35-63+1)
=1111x(1-28)
=1111x(-27)
=-29997
9999+6666x21+3333x55
=3x3333+3333x2x21+3333x55
=3333x(3+2x21+55)
=3333x(3+42+55)
=3333x100
=333300
=199.9x19.98-19.98x10x19.97
=199.9x19.98-19.98x199.7
=(199.9-199.7)x199.8
=0.2x199.8
=39.96
7777x5-9999x7+2222
=1111x7x5-1111x9x7+2x1111
=1111x35-1111x63+2x1111
=1111x(35-63+1)
=1111x(1-28)
=1111x(-27)
=-29997
9999+6666x21+3333x55
=3x3333+3333x2x21+3333x55
=3333x(3+2x21+55)
=3333x(3+42+55)
=3333x100
=333300
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