（4/9+5/6-1/3）×36
=4/9×36+5/6×-1/3×36
=16+30-12
=34
12×（1/6-1/8）×24
=12×1/6×24-12×1/8×24
=2×24-12×3
=48-36
=12
3/7x3/13x7x13
=（3/7×7）x（3/13x13）
=3×3
=9
3/8x(8+15)x1/3
=3/8×8×1/3+3/8×15×1/3
=1+15/8
=2又7/8
7/13x5/11+5/13x4/11
=5/13x7/11+5/13x4/11
=5/13x（7/11+4/11）
=5/13x1
=5/13
98x2/5+4/5
=（98+2）×2/5
=100×2/5
=40
(11/18+8/9)x2/3x1/2
=3/2x2/3x1/2
=1×1/2
=1/2
可不可写在纸上拍张照片，这样都看不懂的
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