计算下面各题,能简算的要简算。
计算下面各题,能简算的要简算。19*7/18(3/4+5/8)*247/8*3/4+1/8*3/45/4*1/8*1644-72*5/121/5+2/9*3/10...
计算下面各题,能简算的要简算。 19*7/18 (3/4+5/8) *24 7/8*3/4+1/8*3/4 5/4*1/8*16 44-72*5/12 1/5+2/9*3/10
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19×7/18 …………………把19写成(18+1)的形式
=(18+1)×7/18
=18×7/18+1×7/18
=7+7/18
(3/4+5/8)×24
=3/4×24+5/8×24
=18+15
=33
7/8×3/4+1/8×3/4
=(7/8+1/8)×3/4
=1×3/4
5/4×1/8×16…………直接交叉约分
=5/2
44-72×5/12
=44—30
=14
1/5+2/9×3/10
=1/5+1/3×1/5
=1/5×(1+1/3)
=1/5×4/3
=4/15
=(18+1)×7/18
=18×7/18+1×7/18
=7+7/18
(3/4+5/8)×24
=3/4×24+5/8×24
=18+15
=33
7/8×3/4+1/8×3/4
=(7/8+1/8)×3/4
=1×3/4
5/4×1/8×16…………直接交叉约分
=5/2
44-72×5/12
=44—30
=14
1/5+2/9×3/10
=1/5+1/3×1/5
=1/5×(1+1/3)
=1/5×4/3
=4/15
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