Question

小数的递等式巧算有答案

3道

Answer 1

(427-238+138+473-95
=（427+473）-（238-138）-95
=900-100-95
=705.

9999×9999+19999
=9999×（10000-1）+19999
=99990000-9999+19999
=99990000+10000
=100000000.
0.034×0.5×0.6
=0.034×（0.5×0.6）
=0.034×0.3
=0.0102
36.72÷4.25×9.9
4.07×0.86+9.125.67×0.2-0.62
18.1×0.92+3.93
0.043×24+0.875
0.4×0.7×0.25
0.78+5.436+1
36.72÷4.25×9.9
3.416÷（0.016×35）
0.8×[(10－6.76)÷1.2]
(6.8-6.8×0.55)÷8.5
0.12× 4.8÷0.12×4.8
9.72×1.6-18.305÷7
3.2×（1.5+2.5）÷1.6
3.2×6+（1.5+2.5）÷1.6
（3.2×1.5+2.5）÷1.6
0.12× 4.8÷0.12×4.8
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
0.8×[(10－6.76)÷1.2]
19.4×6.1×24
5.67×0.2-0.62
18.1×0.92+3.93
0.4×0.7×0.25
0.75×102

2.5×7.1×4 16.12×99＋16.12 5.2×0.9＋0.9
7.28×99+7.28 4.3×50×0.2 64－2.64×0.5
26×15.7＋15.7×24 (2.275 ＋0.625)×0.28
3.94+34.3×0.2 1.2×(9.6÷2.4)÷4.8
8.9×1.1×4.7 2.7×5.4×3.9 3.6×9.85-5.46
8.05×3.4+7.6 6.58×4.5×0.9 2.8×0.5+1.58
32＋4.9－0.9 4.8－4.8×0.5 (1.25－0.125)×8
4.8×100.1 56.5×99＋56.5 7.09×10.8－0.8×7.09
4.85 + 0.35 ÷ 1.4 8.7 × 17.4 - 8.7 × 7.4
12.5×0.4×2.5×8 0.87×3.16+4.64 9.5×101
0.68 ÷（5.2 -3.5）× 1.25
40.5 ÷ 0.81 × 0.18 4.8 ×（15 ÷ 2.4） 2．13.×0.×8257
6.81+6.81×99 0.25×185×40 4.4×0.8－3.4×0.8
(9.37+9．37+9．37+9．37)× 2．5 4．2.×1.＋1.×1.75
2.37×6.3+2.37×3.7 2.5×1.25×0.32 3.8×10.1
2.5×(3.8×0.04) 7.69×101 3.8×10.1
0.25×39+0.25 0.125×72 46×0.33+54×0.33
(8×5.27) ×1.25 6.81+6.81×99 0.25×185×40
6.8×0.75÷0.5 3.75÷0.125–2.75 1.53+23.4÷7.2
9.5×99 13.5×0.98 12.5×8.8

Answer 2

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小数递等式巧算有答案