(1)2/3-5/8×2/3 (2)4/13×2/7+4/7×11/13 用简便计算
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1:2/3-5/8×2/3
=2/3×(1-5/8)
=2/3×3/8
=1/4
2:4/13×2/7+4/7×11/13
=4/7×2/13+4/7×11/13
=4/7×(2/13+11/13)
=4/7×13/13
=4/7
=2/3×(1-5/8)
=2/3×3/8
=1/4
2:4/13×2/7+4/7×11/13
=4/7×2/13+4/7×11/13
=4/7×(2/13+11/13)
=4/7×13/13
=4/7
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2/3-5/8×2/3
=2/3×(1-5/8)
=2/3×3/8
=1/4
4/13×2/7+4/7×11/13
=4/13×2/7+2/7×2×11/13
=2/7×(4/13+22/13)
=2/7×26/12
=2/7×2
=4/7
=2/3×(1-5/8)
=2/3×3/8
=1/4
4/13×2/7+4/7×11/13
=4/13×2/7+2/7×2×11/13
=2/7×(4/13+22/13)
=2/7×26/12
=2/7×2
=4/7
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