(1)4/25x99+4/25=4/25x(100-1)+4/25=16-4/25+4/25=16
(2)1/7x6x7/8=6x1/8=3/4
(3) 3/4x24+24x2/3=18+16=34
(4) (1/2-4/13)x26=13-8=5
2.(1) 5/4-1/3x9/5=5/4-3/5=13/20
(2) 7/9x7+1/9=49/9+1/9=50/9
(3) 1-6/7x7/36=1-1/6=5/6
(4) 87x5/86=435/86
(5) 7/15x29+8/15x29=(7/15+8/15)x29=29
(6) 8/13x2/9x18=8/13x4=32/13
3.(1) cuo 10-7x2/21=10-2/3=28/3
(2)cuo 5/13+2/13x13/4=5/13+1/2=23/26
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