(3/8+1/15)x8+7/15(简算)

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(3/8+1/15)x8+7/15(简算)(3/8+1/15)x8+7/15(简算)(3/8+1/15)x8+7/15(简算)(3/8+1/15)x8+7/15=3+8/15+7/15=3+1=4

(3/8+1/15)x8+7/15(简算)
(3/8+1/15)x8+7/15(简算)

(3/8+1/15)x8+7/15(简算)
(3/8+1/15)x8+7/15
=3+8/15+7/15
=3+1
=4