计算下面各题能简算的要简算 1.3/4×3/5+2/5×3/4= = = = 2.8×5/6+2/5÷4= = = =
1.3/4×3/5+2/5×3/4
=1/4x 1/5 x3(1.3+2)
=3/20 x3.3
=9.9/20
=99/200
2.8×5/6+2/5÷4
=14/5 x 5/6 +2/5 x 1/4
=2/5 (7 x 5/6 + 1/4)
=2/5(70/12 + 3/12)
=2/5 x 73/12
=73/30
=1/4x 1/5 x3(1.3+2)
=3/20 x3.3
=9.9/20
=99/200
2.8×5/6+2/5÷4
=14/5 x 5/6 +2/5 x 1/4
=2/5 (7 x 5/6 + 1/4)
=2/5(70/12 + 3/12)
=2/5 x 73/12
=73/30
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第1个回答 2014-02-09
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