1樓:匿名使用者
【1-(3/7+5/14)】÷1/7
=【1-(3/7+5/14)】*7
=1*7-(3/7+5/14)*7
=7-(3/7*7+5/14*7)
=7-(3+5/2)
=7-3-5/2
=4-5/2
=3/2
4×【(5/6+2/3)÷6】
=4×【(5/6+4/6)÷6】
=4×【3/2÷6】
=4×【3/2×1/6】
=4×1/4
=1(32×1/4+17)÷5/12
=(8+17)÷5/12
=25÷5/12
=25*12/5
=5*12=60
2樓:物理教與學
【1-(3/7+5/14)】÷1/7
=[1-(6/14+5/14)]÷1/7
=(1-9/14)÷1/7
=(14/14-9/14)÷1/7
=5/14÷1/7
=5/14x7
=5/2
4×【(5/6+2/3)÷6】
=4x[(5/6+4/6)÷6]
=4x(3/2÷6)
=4x(3/2x1/6)
=4x1/4
=1(32×1/4+17)÷5/12
=(8+17)÷5/12
=25÷5/12
=25x12/5=60
(1)(-1/42)÷(1/6-3/14+2/3-2/7)用簡便方法 (2)(-2007/5/6)
3樓:匿名使用者
(1)(-1/42)÷(1/6-3/14+2/3-2/7)
解:原式的倒數為(1/6-3/14+2/3-2/7)÷(-1/42)
=(1/6-3/14+2/3-2/7)×42
=1/6×(-42)-3/14×(-42)+2/3×(-42)-2/7×(-42)
=-7-(-9)+(-28)-(-12)
=2+(-28)-(-12)
=-26-(-12)
=-14
故原式=-1/14
(2)(- 2007/5/6)+(- 2006/2/3)+(- 1/1/2)+4000/3/4
解:(- 2007/5/6)+(- 2006/2/3)+(- 1/1/2)+4000/3/4
=【- 2007+(- 5/6)】+【-2006+(- 2/3)】+【-1+(- 1/2)】+(4000+3/4)
=【-2007+(-2006)+(-1)+4000】+【- 5/6+(- 2/3)+(- 1/2)+3/4】
=14+2.75
=16.75
(3)請你用4,-4,7,7這四個數運用加、減、乘、除、乘方、括號組成乙個結果等於24的數,並寫出過程。
解:-{7×[4÷7+(-4)]}
=-{7×[4/7+(-4)]}
=-[7×(- 24/7)]
=-(-24)
=24請問還有疑問嗎?如果沒有就請採納。
計算下面各題,能簡算的要簡算。 45×(3/5+5/9) 3/14÷【6/7×(1/3+1/4)】 (7/3+7/4-7/12)×6/7
4樓:匿名使用者
45×(3/5+5/9) = 45×8/9 = 40
3/14÷【6/7×(1/3+1/4)】= 3/14÷【6/7×12/7】= 3/14÷2 = 3/28
(7/3+7/4-7/12)×6/7 = 7/3×6/7+7/4×6/7-7/12×6/7 = 2+3/2-1/2 = 3
(2/3-5/9×3/5)÷7/16 =(2/3-1/3)÷7/16 = 1/3*16/7 = 16/21
1/9×3+1/9×5+1/9 = 3/9+5/9+1/9 = 9/9 = 1
7/8×3/7+7/8 = 3/8+7/8 = 10/8 = 5/4
(1/2+11/8×3/2)÷1/2 = (1/2+11/8×3/2)×2 = 1/2×2+11/8×3/2×2 = 1 + 33/8 = 41/8
(1/3+1/5+1/15)×15 = 1/3×15 +1/5×15+1/15×15 = 5+3+1 = 9
/14÷(1/3*6/7-1/14) 1/7+7/8*5/7-3/8 【1/2+(3/4-3/5)】÷7/10 簡便計算
5樓:雨之雪
9/14÷(1/3*6/7-1/14)=9/14÷(2/14-1/14)=9/14÷1/14=9/14*14=9
【1/2+(3/4-3/5)】÷7/10 =[1/2+(15/20-12/20)]÷7/10=(1/2+3/20)÷7/10
=13/20*10/7
=13/14
簡便方法 5/14除【6/7*(4/9+1/6)】 8/9除【(2/5+1/10)*4/3】
6樓:洛姣六高昂
5/14除【6/7*(4/9+1/6)】
=5/14÷[6/7×4/9+6/7×1/6]=5/14÷[8/21+1/7]
=5/14÷11/21
=15/22
8/9除【(2/5+1/10)*4/3】
=8/9÷[1/2*4/3]
=8/9÷2/3
=4/3
1/2-4乘以1/4除以4 5/14除以[6/7乘以(2/3+1/6)] 36乘以(2/9+1/4) 都要簡便演算法啊!
7樓:新野旁觀者
1/2-4乘以1/4除以4
=1/2-1/4
=1/4
5/14除以[6/7乘以(2/3+1/6)]=5/14÷【6/7×2/3+6/7×1/6】=5/14÷【4/7+1/7】
=5/14÷5/7
=5/14×7/5
=1/2
36乘以(2/9+1/4)
=36×2/9+36×1/4
=8+9=17
34/15-(4/15+2/5) 2-3/8÷7/16-1/7 5/12÷8+1/8×7/12 2/3×8/5+1/3÷5/8 (1/4-1/20)×40
8樓:匿名使用者
第乙個題要是能寫清楚點就好了 感覺有點亂 不過按順序一一算能算出來
3/4×【(7/15-1/5)÷2/3】=3/4×3/2×(7/15-1/5)
=3/4×3/2×(7/15-3/15)
=3/4×3/2×4/15
= 3/10
3/5×(1/7+8/21÷2/3)=3/5×(1/7+4/7)=3/5×5/7=3/7
(2/3-3/4×1/3)÷5/4=(2/3-1/4)×4/5=2/3×4/5-1/4×4/5
=8/15-3/15
=5/15
=1/3
1/2-8/9÷5/6×3/16 =1/2-1/5=3/10
(5/12+1/9-3/8)×72 = 5/12×72 +1/9×72 -3/8 ×72
=30 +8-27
=5【1-(75%+1/12)】×3/2=【1-(3/4+1/12)】×3/2
=【1-5/6】×3/2
=1/6×3/2
=1/4
9樓:百度使用者
()*3/2=4/3,5/2÷()=5/4
5-(6/7÷3/14+3/16÷3/8)簡便3/4÷【(3/5-1/4)×3/7】簡便 5
10樓:匿名使用者
5-(6/7÷3/14+3/16÷3/8)=5-(4+1/2)
=5-4又2分之1
=1/2
3/4÷【(3/5-1/4)×3/7】
=3/4÷3/7÷(3/5-1/4)
=7/4÷(3/5-1/4)
=7/4÷7/20
=5這兩個都沒什麼簡算的
11樓:刷分的全家不舉
5-(6/7÷3/14+3/16÷3/8)=5-(4+1/2)
=5-4-1/2
=1/2
3/4÷【(3/5-1/4)×3/7】
=3/4÷(7/20x3/7)
=3/4÷3/20
=3/4x20/3=5
9/14÷(1/3*6/7-1/14) 1/7+7/8*5/7-3/8 【1/2+(3/4-3/5)】÷7/10 簡便計算
12樓:妙酒
9/14÷
(1/3*6/7-1/14)
=9/14÷(2/7-1/14)
=9/14÷3/14
=31/7+7/8*5/7-3/8
=1/7+5/8-3/8
=1/7+1/4
=4/28+7/28
=11/28
【1/2+(3/4-3/5)】÷7/10
=(0.5+0.75-0.6)÷0.7
=0.65÷0.7
=13/14
能簡便簡便計算
解 12 13 14 13 1 13 1 13 13 1 13 10 3 1 13 100 60 9 1 13 168 13 168 10 3 168 10 168 3 1680 100 60 8 3 1680 300 180 24 1980 204 2184,56 7 9 8 9 72,234 1...
脫式計算(能簡便的要簡便),脫式計算(能簡便要簡便計算)
5 9 9 4 9 1 9 2 3 5 6 3 4 3 8 7 11 2 5 1 7 10 5 9 4 9 1 9 2 3 5 6 8 3 3 4 8 3 7 11 2 5 3 10 1 1 9 2 3 20 9 2 7 11 10 1 9 8 9 70 11 如果對你有幫助,請採納。謝謝。要採納最...
能簡便要簡便計算20 2
仉旭彬 1 20.2 0.4 7.88 4.2 8.08 7.88 4.2 15.96 4.2 3.8 2 3.75 2.35 9.9 6.1 9.9 6.1 10 0.1 6.1 10 6.1 0.1 61 0.61 60.39 3 12 7.5 36 7.2 12 7.5 36 7.2 12 7...