四年级下册简便运算100道乘法

0.25×16.2×4 (1.25－0.125)×8 3.6×102

3.72×3.5＋6.28×3.5 15.6×2.1－15.6×1.1 4.8×10.1

4.8×7.8＋78×0.52（怎样变化？） 56.5×99＋56.5 7.09×10.8－0.8×7.09

1.87×9.9＋0.187 4.2×99＋4.2 1.25×2.5×32

3.83×4.56＋3.83×5.44 4.36×12.5×8 9.7×99＋9.7

27.5×3.7－7.5×3.7 0.65×101 3.2×0.25×12.5

3.14×0.68＋31.4×0.032 7.2×0.2＋2.4×1.4 8.9×1.01

7.74×（2.8－1.3）＋1.5×2.26 3.9×2.7＋3.9×7.3 12.7×9.9＋1.27

5.4×11-5.4 2.3×16+2.3×23+2.3 3.65×4.7－36.5×0.37

46×57＋23×86 2.22×9.9+6.66×6.7 101×0.87-0.91×87

10.7×16.1-15.1×10.7 0.39×199 0.32×403

0.25×36 0.25×0.73×4 3.65×10.1

7.6×0.8＋0.2×7.6 0.85×9.9 0.25×8.5×4

1.28×8.6＋0.72×8.6 12.5×0.96×0.8 10.6×0.35－9.6×0.35

题目呢？？

0.25×16.2×4
(1.25－0.125)×8
3.6×102
3.72×3.5＋6.28×3.5
15.6×2.1－15.6×1.1
4.8×10.1
4.8×7.8＋78×0.52
56.5×99＋56.5
7.09×10.8－0.8×7.09
1.87×9.9＋0.187
4.2×99＋4.2
1.25×2.5×32
3.83×4.56＋3.83×5.44
4.36×12.5×8
9.7×99＋9.7
27.5×3.7－7.5×3.7
0.65×101
3.2×0.25×12.5
3.14×0.68＋31.4×0.032
7.2×0.2＋2.4×1.4
8.9×1.01
7.74×（2.8－1.3）＋1.5×2.26
3.9×2.7＋3.9×7.3
12.7×9.9＋1.27
5.4×11-5.4
2.3×16+2.3×23+2.3
3.65×4.7－36.5×0.37
46×57＋23×86
2.22×9.9+6.66×6.7
101×0.87-0.91×87
10.7×16.1-15.1×10.7
0.39×199
0.32×403
0.25×36
0.25×0.73×4
3.65×10.1
7.6×0.8＋0.2×7.6
0.85×9.9
0.25×8.5×4
1.28×8.6＋0.72×8.6
12.5×0.96×0.8
10.6×0.35－9.6×0.35

.6×2.9
3.77×1.8
0.02×96
5.22×0.3
9.99×0.02
4.67×0.9
5×2.44
1.666×6.1
9.432×0.002
5.6×6.5
4.88×2.9
5.61×4.3
8.9×2.4
5.5×55
9.77×0.02
1.384×5.1
8.78×83
2.6×61
0.059×0.2
4.268×1.7
57×5.7
9.46×2.85
17.8×6.4
1.5×4.9
2.5×0.88
5.555×5.2
2.22×3.33
7.658×85
36.02×0.3
56.78×8

先乘再加
两个数相乘，交换因数的位置，积不变。ab=ba。乘法结合律。

如果你学逗历饥过平方差公山返式你可以参考上面的答案烂镇
如果没有学过
99×99
=(100-1)×99
=9900-99
=9900-(100-1)
=9900-100+1
=9800+1
=9801