1樓:樂為人師
15×(2/3+3/5)
= 15×2/3+15×3/5
=10+9
=19〖5/6-(1/8+5/12)〗×3/7=[5/6-13/24]×3/7
=7/24×3/7
=1/8
計算下面各題,能簡便計算的要簡便計算。 3/5+3/4-5/6 8/9+2/7+5/7 15/8-3/4-1/4 = = = = = =
2樓:吃葷的兔子
3/5+3/4-5/6 8/9+2/7+5/7 15/8-3/4-1/4
=36/60+45/60-50/60 =8/9+1 =15/8-1
=31/60 =17/9 =7/8
9/7-1/6+3/7 7/4-12/23-3/4 5-6(3/8+1/6)
= 12/7-1/6 = 1-12/23 =5-(9/4+1)
= 72/42-7/42 =11/23 =7/4
=65/42
計算下面各題,能簡算的要簡算.①[3.2×(1- 5 8 )+3 3 5 ]×2 1 12
3樓:今生窒諳
①[3.2×(1-5 8
)+33 5
]×21
12=[3.2×3 8
+33 5
]×21
12=[1.2+33 5
]×21
12=4.8×21
12=10;
②13 7
+2415
+44 7
+3215
=(13 7
+44 7
)+(24
15+32
15)=6+52 5
=112 5
;③43
97×99
=43 97
×(97+2)
=43 97
×97+43
97×2
=43+86
97=4386
97;④1.8×1 4
+2.2×25%
=1.8×0.25+2.2×0.25
=(1.8+2.2)×0.25
=4×0.25=1.
計算下面各題,能簡算的要簡算。3/5÷6÷1/15速度!!
4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
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
計算下面各題能簡算的要簡算6/5-2/1+3/1
6樓:匿名使用者
6/5-2/1+3/1
5/6-1/2+1/3
=(5-3+2)/6
=4/6
=2/3
=3分之2
7樓:華山論劍
5/6-1/2+1/3=5/6-(3/6-2/6)=5/6-1/6=4/6=2/3
計算下面各題,能簡算的要簡算
31.9 18 8 31.9,31.9 18 8 31.9 10,319 21 13 2 5 911,21 11 15 911,21 15 11 119,35 2 3 215 45,23 45 2 15 45,30 6,36 1 1 100 70 27,1 7 10 27,310 72 2120 1...
計算下面各題,能簡算的要簡算
1 7 125 8 7 125 8 7 1000 7000 2 120 20 2 45 120 40 45 80 45 125 3 35 32 128 32 35 32 4 35 36 1260 4 43 36 36 57 43 57 36 100 36 3600 5 640 4 16 8 640 ...
計算下面各題,能簡算的要簡算,並寫出主要的簡算過程(1)9 06 2 68 0 32(2)(3 06 0 25 2 76)
1 9.06 2.68 0.32,9.06 2.68 0.32 9.06 3,6.06 2 3.06 0.25 2.76 0.2,12.24 2.76 0.2,15 0.2,3 3 18 3 5 4 25 18 0.6 4 52 18 0.6 10 18 10.6,7.4 4 2.7 1.25 5....