苏教版四年级下册数学补充习题第52页答案
【www.lfbaililian.com--四年级数学】
练习十1.
乘法结合律
乘法交换律和结合律
乘法分配律
2.
√ x √ x
[本题感谢qq632215043的网友纠错]
3.
=18x(200+1)
=18x200+18
=3600+18
=3618
=125x8+125x20
=1000+2500
=3500
=15x2x27
=30x27
=810
=76x(100-1)
=76x100-76
=7600-76
=7524
=27x(38+62)
=27x100
=2700
=84x(99+1)
=84x100
=8400
4.
=45x(20-2)
=45x20-45x2
=900-90
=810
=71x(100+1)
=71x100+71
=7100+71
=7171
=29x(4x5)
=29x20
=580
[红色部分为后修改,感谢兔小玲?网友纠错]
=25x4x9
=100x9
=900
=35x(10+2)
=35x10+35x2
=350+70
=420
=6x5x17
=30x17
=510
文档为doc格式