1楼：匿名用户
42x29-18x42-21x2
=42x29-18x42-42x1
=42x(29-18-1)
=42x10
=420
2楼：百度网友
42x29-18x42-21x2
=42x(29-18-1)
=42x10
=420
3楼：匿名用户
42*29-18*42-21*2
=42*29-18*42-42*1
=42*（29-18-1）
=42*10
=420
五年级口算题（带答案）
4楼：匿名用户
17×40＝
680, 100－63＝37, 3.2＋1.68＝4.88, 2.8×0.4＝ 1.12
14－7.4＝6.6, 1.92÷0.04＝48, 0.32×500＝160, 0.65＋4.35＝ 5
10－5.4＝4.6, 4÷20＝0.2, 3.5×200＝700, 1.5－0.06＝1.44
0.75÷15＝0.05, 0.4×0.8＝0.32, 4×0.25＝1, 0.36＋1.54＝2
1.01×99＝99.99, 420÷35＝12, 25×12＝300, 135÷0.5＝270
3/4 + 1/4 =1, 2 + 4/9 =22/9, 3 - 2/3 =7/3, 3/4 - 1/2= 1/4
1/6 + 1/2 -1/6 =1/2, 7.5-(2.5+3.8)=1.2, 7/8 + 3/8 =5/4
3/10 +1/5 =1/2, 4/5 - 7/10 =1/10, 2 - 1/6 -1/3 =1.5
0.51÷17＝0.03, 32.8＋19＝51.8, 5.2÷1.3＝4, 1.6×0.4＝ 0.64
4.9×0.7＝3.43, 1÷5＝0.2, 6÷12＝0.5, 0.87－0.49＝0.38
1.(1+1/2)(1+1/3)(1+1/4)......(1+1/100)
2.(1-1/2)(1-1/3)(1-1/4)......(1-1/100)
3.8+2-8+2
4.25*4/25*4
5.7.26-(5.26-1.5)
6.286+198
7.314-202
8.526+301
9.223-99
10.6.25+3.85-2.125+3.875
11.9-2456*21
12.0.5/11.5-4*2.75
13.1/2×3/5
14.3.375+5.75+2.25+6.625
15.1001－9036÷18
16.3.8×5.25+14.5
17.2.1*4.3+5.7*2.1
18.30×1/3
19.102*45-328
20.2/3×12
21.2.8*3.1+17.6/8
22.3/5×5/6
23.(50-12.5)/2.5
24.2/5×1/3
25.6110*47+639
26.1/2-1/6
27.3.5*2.7-52.2/18
28.1/7×1/5
29.3.375*0.97+0.97*6.625
30.25×4/5
31.6.54+2.4+3.46+0.6
32.5/6-1/2
33.95.6*1.8+95.6*8.2
34.1/2×1/5
35.600-420/12
36.344/3.6-5.4*0.25
37.16/2+30/2+90/6
38.3001-1998.
39.5000-105*34
40.0.15/0.25+0.75*1.2
41.(1/2+1/3+1/4)*0.24
42.(25+4)*4
43.300-4263/21
44.0.81/0.25+5.96
45.403÷13×27
46.1.5×4.2－0.75÷0.25
47.3.27×4 +3.27×5.7
48.（1.2+ 1.8）×4.51025－768÷32
49.0.25×80－0.45÷0.9
50.1025－768÷32
51.0.25*2.69*4
52.2348+275*16
53.2/9*15/8-1/12*9/5
54.2.4+2.4*(5.375-3.375)
55.645-45*12
56.0.15+1.2/0.24-0.45
57.3.75-(2.35+0.25/1.25)
58.76*1/4+23*25/100+0.25
59.10-2.87-7.13
60.0.96+9.6*9.9
61.7.5-5.7*1/3
62.12.37-3.25-6.75
63.16*6.8+2.2*16+16
64.401*19+284
65.58.7-16.65/3.7
66.0.4*4.7*2.5+(2.3+5.3)
67.9.31-1.125-7.875
68.640+128*45
69.8.2*1.6-0.336/4.2
70.400*(0.62+0.08)
2/1*2=1 3/1*3=1 3/2*3=2 3/1*6=2
4/3*8=6 5/3*20=12 7/3*14=6 8/7*40=35
4/3*16=12 9/5*27=15 2/1*30=15 12/7*24=14
30/1*30=1 51/9*102=18 19/9*76=36 4/9*8=18
5/8*90=144 99/98*99=98 3/14*6=28 7/1*28=4
10/1*90=9 5/3*105=63 19/7*38=14 5/1*25=5
8/19*16=38 61/60*122=120 7/2*28=8 6/1*48=8
9/7*18=14 25/7*100=28 9/5*81=45 8/9*16=18
123+25=148 123-35=88 56×7=392 135÷5=27
248+89=337 ... 146-23=123 ... 155×5=775 ... 456-12=38...
456+45=501 ...546-457=89 ... 45×10=451 ... 564-12=47...
879+54=933 ...896-546=350 ...56×12=672.... 45-5=9...
457+456=913...
脱式计算
30.8÷[14－(9.85＋1.07)]
[60－(9.5＋28.9)]÷0.18
2.881÷0.43－0.24×3.5
20×[(2.44－1.8)÷0.4＋0.15]
28-(3.4+1.25×2.4)
2.55×7.1+2.45×7.1
777×9+1111×3
0.8×〔15.5-(3.21+5.79)〕
（31.8+3.2×4）÷5
31.5×4÷(6+3)
0.64×25×7.8+2.2
2÷2.5+2.5÷2
194－64.8÷1.8×0.9
36.72÷4.25×9.9
5180－705×6
24÷2.4－2.5×0.8
(4121+2389)÷7
671×15-974
469×12+1492
405×(3213-3189)
3.416÷（0.016×35）
0.8×[(10－6.76)÷1.2]
19.4×6.1×2.3
5.67×0.2-0.62
18.1×0.92+3.93
0.0430.24+0.875
0.4×0.7×0.25
0.75×102 100-56.23
0.78+5.436+1
4.07×0.86+9.12.5
30.8÷[14－(9.85＋1.07)]
[60－(9.5＋28.9)]÷0.18
2.881÷0.43－0.24×3.5
20×[(2.44－1.8)÷0.4＋0.15]
28-(3.4+1.25×2.4)
2.55×7.1+2.45×7.1
777×9+1111×3
0.8×〔15.5-(3.21+5.79)〕
（31.8+3.2×4）÷5
31.5×4÷(6+3)
0.64×25×7.8+2.2
2÷2.5+2.5÷2
194－64.8÷1.8×0.9
36.72÷4.25×9.9
5180－705×6
24÷2.4－2.5×0.8
(4121+2389)÷7
671×15-974
469×12+1492
405×(3213-3189)
3.416÷（0.016×35）
0.8×[(10－6.76)÷1.2]
19.4×6.1×2.3 5.67×0.2-0.62
18.1×0.92+3.93 0.0430.24+0.875
0.4×0.7×0.25 0.75×102 100-56.23
0.78+5.436+1 4.07×0.86+9.12.5
简算是乘号 /是除号
0.3*2.5*0.4
50*0.13*0.2
0.8*630*0.125
0.78*101
1.5*102
9.8*25
1.2*2.5+0.8*2.5
1.25*0.7*0.8
0.038*5*2.1
3.8+4.5+6.2
93/0.31/3
3.25－0.84-0.16
88*0.25*4
2.8*3.6+1.4*2.8
63*10.1
（3.2+0.128）/0.8
9.83*1.5+6.17*1.5
10.1*87
312*4+188*4
0.135*500*0.2
6.3+0.84+3.7+8.16
18.75-0.43-4.57
0.25*0.03*4
13.7*0.25*8
2.65*1.7+1.35*1.7
32.8+5.6+7.2
（2.5+0.25）*0.4
8*（2.5*0.25）
8.4*0.2+1.6*0.2
1.25*0.8*0.5
（1.5+0.25）*0.4
1.2*0.4+1.3*0.4
方程9+6x=14
x+9x=4+7
2x+9=17
8-4x=6
6x-7=12
7x-9=8
x-56=1
8-7x=1
x-30=12
6x-21=21
6x-3=6
9x=18
4x-18=13
5x+9=11
6-2x=11
x+4+8=23
7x-12=8
x-5.7=2.15
15 5x-2x=18
3x 0.7=5
x＋13＝33
3 － 5x＝80
1.8 +6x＝54
6.7x －60.3＝6.7
9 ＋4x ＝40
2x+8=16
3.5×2= 4.2 x
26×1.5= 2x
0.5×16―16×0.2=4x
9.25－x=0.403
16.9÷x=0.3
x÷0.5=2.6
3－5x＝80
1.8-6x＝54
6.7x－60.3＝6.7
9 ＋4x＝40
0.2x－0.4＋0.5＝3.7
9.4x－0.4x＝16.2
12－4x＝20
1/3x＋5/6x＝1.4
12x＋34x=1
18x－14x=12
23 x－5×14=14
12＋34x=56
22－14x=12
23x-14x=14
x＋14x=65
23x=14x＋14
30x12x－14x=1
x-0.7x=3.6
这是我自己打上去的抄袭者必死
125x25x4x4怎么简便算,125x25x4x4用简便计算
1楼 匿名用户 125x25x4x4 125 4 25 4 500 100 50000 125x25x4x4用简便计算 2楼 匿名用户 125x4 x 25x4 500x100 50000 3楼 鱼央邸千山 56x25x4x125 7x8x125x25x4 7x 8x125 x 25x4 7x100...
脱式计算.（怎么简便就怎么算,脱式计算.（怎么简便就怎么算.）① 5 6
1楼 新野旁观者 1 5 6 1 3 1 4 ， 5 6 7 12 1 4 2 3 8 3 10 5 6 3 8 1 4 1 8 3 4 8 3 3 5 4 3 8 3 5 3 2 3 5 9 10 4 3 8 1 10 3 5 3 8 10 3 5 15 4 3 5 9 4 5 24 1 4 1 ...
0.25x8简便计算,7.1x0.25x8的简便计算
1楼 匿名用户 0 25 8 0 25 4 2 2 本题是利用0 25 4 1，此外还有0 125 8 1，0 5 2 1，解决这类问题用到乘法分配率或乘法结合率。比如0 125 16 0 125 4 2 2 2楼 匿名用户 0 25 8 0 25 4 2 1 2 2 7 1x0 25x8的简便计算...