小学数学简便运算
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2)=6/13×11/19+6/13×8/19
=6/13×(11/19+8/19)
=6/13×1
=6/13
3)=137×139/138-137×1/138
=137×(139/138-1/138)
=137×1
=137
=6/13×(11/19+8/19)
=6/13×1
=6/13
3)=137×139/138-137×1/138
=137×(139/138-1/138)
=137×1
=137
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