1樓:入戲
(1)1.36+4.85+2.64+6.15,=(1.36+2.64)+(4.85+6.15),=4+11,
=15;
(2)98.5÷2.5÷4,
=98.5÷(2.5×4),
=98.5÷10,
=9.85;
(3)5.4÷[2.5×(3.7-2.9)],=5.4÷[2.5×0.8],
=5.4÷2,
=2.7;
(4)0.8×(4-3.68)÷0.01,=0.8×0.32÷0.01,
=0.256÷0.01,
=25.6;
(5)83.7-12.83-0.17,
=83.7-(12.83+0.17),
=83.7-13,
=70.7;
(6)5.96+13×(3.2-3.12),=5.96+13×0.08,
=5.96+1.04,=7.
下面各題,能用簡便方法計算的用簡便方法計算:2.5×12.5×32 6.4÷2.5÷0.4 5.4×0.36+0.64×5.4 9
2樓:古玉紅
(1)2.5×12.5×32
=(2.5×4)×(12.5×8),
=10×100,
=1000;
(2)6.4÷2.5÷0.4
=6.4÷(2.5×0.4),
=6.4÷1,
=6.4;
(3)5.4×0.36+0.64×5.4
=5.4×(0.36+0.64),
=5.4×1,
=5.4;
(4)9÷0.75+9÷0.25
=12+36,
=48;
(5)17.2-0.71-0.29
=17.2-(0.71+0.29),
=17.2-1,
=16.2;
(6)8.6+1.4÷2.5
=8.6+0.56,
=9.16.
計算下面各題,能簡算的要簡算。3/5÷6÷1/15速度!!
3樓:匿名使用者
3/5÷6÷1/15
=3/5÷1/15÷6
=3/5x15÷6
=9÷6
=1.5
50×(3/10+1/5)
=50×(3/10+2/10)
=50×1/2
=25
3/8×4/7÷3/8×4/7
=3/8÷3/8×4/7×4/7
=1×4/7×4/7
=16/49
2/7÷8+5/7×1/8
=2/7×1/8 +5/7×1/8
=(2/7+5/7)×1/8
=1×1/8
=1/8
15÷9/25×4/5
=15×4/5÷9/25
=12x25/9
=100/3
﹙13-3/10﹚÷3/5
=﹙130-3)/10x5/3
=127/10x5/3
=127/6
下面各題,能簡便計算的要用簡便方法計算.68×35-408÷24 57+98×79+18(0.63-0.63÷3)×0.53.
4樓:手機使用者
(制1)68×
35-408÷24
=2380-17
=2363;
(2)57+9
8×79+1
8=57+(78+1
8)=57
+1=157;
(3)(0.63-0.63÷3)×0.5
=(0.63-0.21)×0.5
=0.42×0.5
=0.21;
(4)3.64×0.25+4.36×0.25=(3.64+4.36)×0.25
=8×0.25
=2;(5)1.3-3.79+9.7-6.21=1.3+9.7-(3.79+6.21)
=11-10
=1;(6)3
22÷[5
4÷(143-1
2)]=322
÷[54
×625]=3
22×103=511.
計算下面各題。(能簡算的要簡算) 1/3×5×2/5÷1/3 1/3×1/15+1
5樓:最美晴天小奕
你敢,很高興為您解答:
1、解:
原式=5×2/5×1/3÷1/3
=5×2/5×1/3×3
=2×1
=22、解:
原式=1/3×(1/15+1/5)
=1/3×4/15
=4/45
3、解:
原式=3.7×6/5+1.3×6/5
=(3.7+1.3)×6/5
=5×6/5
=64、解:
原式=3/4-(6/7-1/4)×17/9=(3/4+1/4-7/16)×17/9
=9/16×17/9
17/16
下面各題能簡算的要用簡便計算.1.36+4.85+2.64+6.15 98.5÷2.5÷4 5.4÷[2.5×(3.7-2.9)]0.8×(4-3.6
6樓:□小千
(1)1.36+4.85+2.64+6.15,=(1.36+2.64)+(4.85+6.15),=4+11,
=15;
(2)98.5÷2.5÷4,
=98.5÷(2.5×4),
=98.5÷10,
=9.85;
(3)5.4÷[2.5×(3.7-2.9)],=5.4÷[2.5×0.8],
=5.4÷2,
=2.7;
(4)0.8×(4-3.68)÷0.01,=0.8×0.32÷0.01,
=0.256÷0.01,
=25.6;
(5)83.7-12.83-0.17,
=83.7-(12.83+0.17),
=83.7-13,
=70.7;
(6)5.96+13×(3.2-3.12),=5.96+13×0.08,
=5.96+1.04,=7.
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