1樓:__馬小跳
原式=11.4+1.3
=12.7
2樓:匿名使用者
2.85×4+6.5÷5
=11.4+1.4
=12.7
五年級下冊脫式計算題及答案
3樓:小露解說
一、5.4÷1.8+240×1.5
=3+360
=363
二、9000÷72×(1.25×0.7×8)=9000÷72×7
=125×7
=875
三、61-(1.25+2.5×0.7)
=61-3
=58四、[(10-0.8)+9.85]-2÷0.125=19.05-2÷0.125
=19.05-16
=3.05
1、脫式計算,即遞等式計算,需將一系列的數字逐步計算。在脫式計算中要先算乘、除法,後算加、減法。在乘除法連繼計算時中,要按從左往右的順序依次計算,在四則運算中,加法和減法叫做第一級運算,乘法和除法叫做第二級運算。
4樓:葉聲紐
(31.8+3.2×
4)÷5
=(31.8+12.8)÷5
=44.6÷5
=8,92,
31.5×4÷(6+3)
=31.5×4÷9
=126÷9
=14.
0.64×25×7.8+2.2
=124.8+2.2
=127.
5樓:匿名使用者
你已經長大了 可以自己出題了
6樓:獨孤嶽麓
1、0.2008+2.008+20.08+200.8+2008
=0.2008×
(1+10+100+1000+10000)
=0.2008×11110
=2230.888
2、1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6)÷......÷(2007÷2008)=1×3/2×4/3×5/4×6/5×......×2008/2007
=2008
3、1+1/3+1/6+1/10+......+1/2009×1004
=2×(1/2+1/6+1/12+1/20+......+1/2008×2009)
=2×(1-1/2+1/2-1/3+1/3-1/4+......+1/2008-1/2009)
=2×(1-1/2009)
=2×2008/2009
=4016/2009
4、2006個2006乘2007個2007再乘2008個2008的積的個位數是?
2006個2006的個位數字是6
2007個2007的個位數字是3
2008個2008的個位數字是6
6×3×6=108
所以2006個2006乘2007個2007再乘2008個2008的積的個位數字是8
5、325.24+425.24+625.24+925.24+525.24
=(300+400+600+900+500)+25.24×5
=2700+126.2
=2826.2
6、1/1×4+1/4×7+1/7×10+1/10×13+......+1/2005×2008
=(1-1/4+1/4-1/7+1/7-1/10+1/10-1/13+......+1/2005-1/2008)÷3
=(1-1/2008)÷3
=2007/2008÷3
=669/2008
7樓:匿名使用者
30+239-58x5o
8樓:匿名使用者
3×5+2=17,100乘8+3=803
9樓:匿名使用者
一、bai5.4÷
1.8+240×1.5
=3+360
=363
二、9000÷du72×(1.25×0.7×8)=9000÷72×7
=125×7
=875
三、61-(1.25+2.5×0.7)
=61-3
=58四、[(10-0.8)+9.85]-2÷0.125=19.05-2÷0.125
=19.05-16
=3.05
1、脫式計算,即遞等zhi式計算,需將一系列dao的數字逐步計算。在脫式計算中要先算乘、除法,後算加、減法。在乘除法連繼計算時中,要按從左往右的順序依次計算,在四則運算中,加法和減法叫做第一級運算,乘法和除法叫做第二級運算。
10樓:匿名使用者
408-12×24 = 408 - 288 = 120
(46+28)×60 = 74 x 60 = 4440
42×50-17 = 2100- 17 = 2083
32+105÷
5 = 32 + 21 = 53
420×(327-238) = 420 x 89 = 37380
(4121+2389)÷7 = 6510 ÷7 = 930
3.416÷(0.016×35) = 3.416 ÷0.56 = 6.1
0.8×[(10-6.76)÷1.2] = 0.8 x(3.24÷1.2) = 0.8 x 2.7 = 2.16
5.67×0.2-0.62 = 1.134-0.62 = 0.514
0.4×0.7×0.25 = 0.4 x 0.25 x 0.7 = 0.1 x 0.7 = 0.07
0.78+5.436+1 = 6.216 +1 = 7.216
30.8÷[14-(9.85+1.07)] = 30.8 ÷ (14 - 10.92) = 30.8÷3.08 = 10
[60-(9.5+28.9)]÷0.18 = (60- 38.4)÷0.18 = 21.6 ÷0.18 = 120
2.881÷0.43-0.24×3.5 = 6.7 - 0.24 x3.5 = 6.7 - 0.84 = 5.86
20×[(2.44-1.8)÷0.
4+0.15] = 20x (0.64 ÷0.
4 +0.15)= 20x(1.6 +0.
15) = 20 x1.75 = 35
28-(3.4+1.25×2.4) = 28 - (3.4 + 3) = 28 - 6.4 = 21.6
2.55×7.1+2.45×7.1 = (2.55 + 2.45) x7.1 = 5 x7.1=35.5
0.8×〔15.5-(3.21+5.79)〕 = 0.8 x (15.5 - 9) = 0.8 x 6.5 = 5.2
(31.8+3.2×4)÷5 = (31.8 + 12.8)÷5 = 44.6÷5 = 8.92
31.5×4÷(6+3) = 126 ÷ 9 = 14
2÷2.5+2.5÷2 = 0.8 + 1.25 =2.05
194-64.8÷1.8×0.9 = 194 -36 x0.9 = 194-32.4 = 161.65180-705×6 = 5180 - 4230=950
24÷2.4-2.5×0.8 =10 -2=8
405×(3213-3189) =405x24 = 9720
125×(97-81) =125x16 =2000
6942+480÷3 = 6942 + 160 = 6782
20+80÷4-20 = 20 + 20 -20 = 40 -20 = 20
100÷(32-30)×0 = 100 ÷2 x0= 50 x0 = 0
25×4-12×5 = 100 - 60 = 40
70×〔(42-42)÷18〕=70 x (0÷18) = 70x0 = 0
75×65+75×35 = 75 x (65 +35) = 75x100 = 7500
6-1.6÷4= 6- 0.4 = 5.6
5.38+7.85-5.37= 13.23 - 5.37=7.86
7.2÷0.8-1.2×5=9 - 6 =3
6-1.19×3-0.43= 6-3.57 - 0.43 = 6- (3.57 + 0.43) = 6-4 = 2
6.5×(4.8-1.2×4)= 6.5 x(4.8 - 4.8 )=6.5 x0 = 0
0.68×1.9+0.32×1.9 = (0.68 + 0.32) x1.9 = 1 x 1.9 = 1.9
10.15-10.75×0.
4-5.7 = 10.15 - 4.
3 - 5.7 = 10.15 -(4.
3 + 5.7)=10.15 - 10 =0.
155.8×(3.87-0.
13)+4.2×3.74 = 5.
8 x 3.74 +4.2 x 3.
74 = (5.8 +4.2)x3.
74 = 10 x 3.74 = 37.4
32.52-(6+9.728÷3.
2)×2.5 = 32.52 - (6+3.
04)x2.5 = 32.52 - 9.
02 x 2.5 = 32.52 -22.
55 = 9.97
(136+64)×(65-345÷23)= 200x(65-15) = 200x 50=10000
11樓:匿名使用者
42×50-17 = 2100- 17 = 2083 32+105÷
5 = 32 + 21 = 53 420×(327-238) = 420 x 89 = 37380 (4121+2389)÷7 = 6510 ÷7 = 930 3.416÷(0.016×35) = 3.
416 ÷0.56 = 6.1 0.
8×[(10-6.76)÷1.2] = 0.
8 x(3.24÷1.2) = 0.
8 x 2.7 = 2.16 5.
67×0.2-0.62 = 1.
134-0.62 = 0.514 0.
4×0.7×0.25 = 0.
4 x 0.25 x 0.7 = 0.
1 x 0.7 = 0.07 0.
78+5.436+1 = 6.216 +1 = 7.
216 30.8÷[14-(9.85+1.
07)] = 30.8 ÷ (14 - 10.92) = 30.
8÷3.08 = 10 [60-(9.5+28.
9)]÷0.18 = (60- 38.4)÷0.
18 = 21.6 ÷0.18 = 120 2.
881÷0.43-0.24×3.
5 = 6.7 - 0.24 x3.
5 = 6.7 - 0.84 = 5.
86 20×[(2.44-1.8)÷0.
4+0.15] = 20x (0.64 ÷0.
4 +0.15)= 20x(1.6 +0.
15) = 20 x1.75 = 35 28-(3.4+1.
25×2.4) = 28 - (3.4 + 3) = 28 - 6.
4 = 21.6 2.55×7.
1+2.45×7.1 = (2.
55 + 2.45) x7.1 = 5 x7.
1=35.5 0.8×〔15.
5-(3.21+5.79)〕 = 0.
8 x (15.5 - 9) = 0.8 x 6.
5 = 5.2 (31.8+3.
2×4)÷5 = (31.8 + 12.8)÷5 = 44.
6÷5 = 8.92 31.5×4÷(6+3) = 126 ÷ 9 = 14 2÷2.
5+2.5÷2 = 0.8 + 1.
25 =2.05 194-64.8÷1.
8×0.9 = 194 -36 x0.9 = 194-32.
4 = 161.6 5180-705×6 = 5180 - 4230=950 24÷2.4-2.
5×0.8 =10 -2=8
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