1樓:炒麵大叔
8.72*45.8/8.72/45.8*8.72 =8.72*45.8/45.8*8.72/8.72=8.72
1.1/[(20+9.744/2.
4)*0.5-1.03]=1.
1/[(20+4.06)*0.5-1.
03]=1.1/(12.03-1.
03)=1.1/11=0.1
[19+1.9*(3.8-0.
38*0.5/0.05)]/0.
38 =[19+1.9*(3.8-3.
8)]/0.38=19/0.38=50
[27*4.5+8/0.6]-[120-(40*0.
25+25/0.5)*2]*1999=[121.5+40/3]-[120-(10+50)*2]*1999=[121.
5+40/3]-0=134.83(約等於)
計算下面各題 脫式計算 (能簡算的要簡算)
2樓:叫啥知不道
一,7分之
1-7分之3÷zhi4
=1/7-1/7*3/4
=1/7*(1-3/4)
=1/7*1/4
=1/28
二,12分之dao
內5÷8分之9×容5分之3
=5/12*8/9*3/5
=2/9
三,2又9分之2÷1又8分之3-9分之2×11分之8=20/9*8/11-2/9*8/11
=(20/9-2/9)*8/11
=2*8/11
=16/11
=1又5/11
四,15-(12分之1+16分之1)×48=15-48*1/12-48*1/16
=15-4-3
=8五,30%[(4分之3-2分之1)×5分之4]=3/10*(3/4*4/5-1/2*4/5)=3/10*1/5
=3/50
六,(2分之9-3分之10)÷5分之14×15%=7/6*5/14*3/20
=1/16
脫式計算下面各題(能簡算的要用簡便方法計算,並寫出簡算過程). 450÷18×25+173. 670+65÷
3樓:匿名使用者
(1)450÷18×25+173,
=25×25+173,
=625+173,
=798;
(2)670+65÷3×35,
=670+65×(13×3
5),=670+65×15,
=670+13,
=683;
(3)58-1
6×45+57,=58
-215
+57,
=59120
+57,
=5759
120;
(4)38-12×6÷16,
=38-72÷16,
=38-4.5,
=33.5.
脫式計算下面各題(能簡算的要用簡便方法計算,並寫出簡算過程). (84×27-2166)÷17 115×3.
4樓:小柒
①(84×27-2166)÷17,
=(2268-2166)÷17,
=102÷17,
=6;②11
5×3.7+5.3÷5
11+2.2,
=2.2×3.7+5.3×2.2+2.2,=2.2×(3.7+5.3+1),
=2.2×10,
=22;
③(0.75÷3-0.1)×(1-23),=(0.25-0.1)×13,
=0.15×13,
=0.05.
計算下面各題,能簡算的要簡算。(脫式計算) (6/35+4/21)÷4/7 2/ 50
5樓:匿名使用者
(6/35+4/21)÷4/7
=6/35×7/4+4/21×7/4
=3/10+1/3
=9/30+10/30
=19/30
2/9÷2/7÷14/15
=2/9×7/2×15/14
=14/18×15/14
=5/6
(5/6-3/4)÷5/12+4/5
=5/6×12/5-3/4×12/5+4/5=2-9/5+4/5
=2-13/5
=-3/5
3/10÷(4/5-1/2)
=3/10×5/4-3/10×2
=3/8-3/5
=15/40-24/40
=-9/40
2/25÷3/7+23/25÷3/7
=(2/25+23/25)÷3/7
=1×7/3
=2又1/3
8/9÷5/6+1/6
=8/9×6/5+1/6
=16/15+1/6
=32/30+5/30
=37/30
=1又7/30
2/3x=16
x=16×3/2
x=24
3/4x+1/4=3/8
3/4x=3/8-1/4
3/4x=1/8
x=1/8×4/3
x=1/6
1/5x-1/2=3/10
1/5x=1/2+3/10
1/5x=8/10
x=8/10×5x=4
6樓:**防騙
6/35x7/4十4/2lx7/4=3/10十1/3=9/30十10/30=19/30
2/9x7/2x1/14=1/185/6
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