Question

3.18x8.1-3.28x7.1简便计算？

Answer 1

3.18×8.1 - 3.28×7.1
= 3.18 + 3.18×7.1 - 3.28×7.1
= 3.18 + （冲明3.18 - 3.28）× 7.1
= 3.18 + （-0.1）散消告桥粗× 7.1
= 3.18 - 0.71
= 3.18 - 1 + 0.29
= 2.47

Answer 2

3.18×8.1-3.28×7.1
=3.18×8.1-（3.18+0.1）清晌×7.1
=3.18×8.1- (3.18×7.1+0.1×7.1)
=3.18×8.1-3.18×7.1-0.1×7.1
=3.18×（答誉锋虚档8.1-7.1）-0.71
=3.18×1-0.71
=3.18-0.71
=2.47

Answer 3

3.18*8.1-3.28*7.1
=3.18*8.1-（颂笑郑野颂3.18+0.1）升闹*7.1
=3.18*8.1-3.18*7.1-0.1*7.1
=3.18*（8.1-7.1）-0.71
=3.18*1-0.71
=2.47

Answer 4

题目打物培错了唯蚂竖，指大第一个数应该是3.28。
3.28×8.1-3.28×7.1
＝3.28×(8.1-7.1)
＝3.28×1
＝3.28