6/13*39+7/13*40
=1/13*(6*39+7*40)
=1/13*(40*13-6)
=40-6/13
=39又7/13
好简单。十三分之六x(99+1)=十三分之六百
十三分之六乘以括号十分之三加一
11/13×6/19+6/13×8/19
=6/13×11/19+6/13×8/19
=6/13×(11/19+8/19)
=6/13×1
=6/13
简便运算题,最后一个数应该是13分之9, 如果是十九分之九就不好搞了。
8/11X4/13+4/33X9/13
=8/11X4/13+4/11X3/13
=4/11X8/13+4/11X3/13
=4/11X(8/13+3/13)
=4/11X11/13
=4/13
13分之4×2+13分之1×6+13分之2×6
=13分之1×(8+6+12)
=13分之1×26
=2
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34乘三十三分之十三
=(33+1)乘三十三分之十三
=13+三十三分之十三
=13又33分之13
7/13÷8+1/8×6/13
=7/13×1/8+1/8×6/13
=1/8﹙7/13+6/13﹚
=1/8×1
=1/8
37*6/53+47*37/53
=(6+47)*37/53
=53*37/53
=37
17又9/13-(2又9/13+4又4/13)-5又9/13
=(17又9/13-2又9/13)-(4又4/13+5又9/13)
=15-10
=5