50道计算题带答案过程

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 = 161.6
5180－705×6 = 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 =0.15
5.8×（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
（48+370）÷（64-45）=418 ÷19 =22
14 × 8/7 – 5/6 × 12/15 =16 - 2/3 = 15x1/3
17/32 – 3/4 × 9/24 = 17/32 - 27/96= 51/96 - 27 /96 = 24/96 = 1/4
3 × 2/9 + 1/3 = 2/3 + 1/3 = 1
5/7 × 3/25 + 3/7 =3/35 + 3/7= 3/35 +15/35= 18/35
1/5 × 2/3 + 5/6 = 2/15 + 5/6 = 4/30 + 25/30 = 29/30
9/22 + 1/11 ÷ 1/2 = 9/22+ 1/11 x 2 = 9/22 +2/11 = 9/22 +4/22 = 13/22
5/3 × 11/5 + 4/3 = 11/3 +4/3 = 15/3 = 5
45 × 2/3 + 1/3 × 15 = 30+5 = 35
7/19 + 12/19 × 5/6 =7/19 + 10/19=17/19
1/4 + 3/4 ÷ 2/3 =1/4+ 1/2 = 1/4 + 2/4 = 3/4
8/7 × 21/16 + 1/2= 3/2+1/2 = 2

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