下面各题怎么简便就怎么算(1) (3/8+1/15)x8+7/15 (2) 3/4x5/9-1/9x3/4 (3) 2/5÷7+1/7x8/15 (4) 1/2+3/8+7/8x7 (5) 1÷6+5x1/6

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下面各题怎么简便就怎么算(1)(3/8+1/15)x8+7/15(2)3/4x5/9-1/9x3/4(3)2/5÷7+1/7x8/15(4)1/2+3/8+7/8x7(5)1÷6+5x1/6下面各题怎

下面各题怎么简便就怎么算(1) (3/8+1/15)x8+7/15 (2) 3/4x5/9-1/9x3/4 (3) 2/5÷7+1/7x8/15 (4) 1/2+3/8+7/8x7 (5) 1÷6+5x1/6
下面各题怎么简便就怎么算
(1) (3/8+1/15)x8+7/15 (2) 3/4x5/9-1/9x3/4 (3) 2/5÷7+1/7x8/15 (4) 1/2+3/8+7/8x7 (5) 1÷6+5x1/6

下面各题怎么简便就怎么算(1) (3/8+1/15)x8+7/15 (2) 3/4x5/9-1/9x3/4 (3) 2/5÷7+1/7x8/15 (4) 1/2+3/8+7/8x7 (5) 1÷6+5x1/6
(1)原式 = 3+8/15+7/15 =4
(2)原式 = 3/4×1/9×(5-1)=1/3
(3)原式 = 2/5×1/7×(1+4/3)= 2/5×1/7×7/3 = 2/15
(4)原式 = 1/8×(4+3+49)= 1/8 × 56 = 7
(5)原式 = 1/6×(1+5) = 1