Question

6.42ⅹ4.6+5.1ⅹ6.42简算？

Answer 1

6.42x4.6＋5.1x6.42简算，6.42x4.6＋5.1x6.42＝6.42x（4.6＋5.1）＝6.42x9.7＝6.42x（10一0.3）＝64.2一1.926＝62.274

Answer 2

6.42x4.6+5.1x6.42
原式=6.42x(4.6+5.1)
=6.42x9.7
=64.2-6.42x0.3
=62.274

Answer 3

①6.42×4.6+5.1×6.42
=6.42×(4.6+5.4)-0.3×6.42
=6.42×10-1.926
=64.2-1.926
=62.274
②6.42×4.9+5.1×6.42
=6.42×(4.9+5.1)
=6.42×10
=64.2
③7.68×101-7.68
=7.68×(101-1)
=7.68×100
=768

Answer 4

6.42×4.6+5.1×6.42
提取公因数6.42：
=6.42×(4.6+5.1)
先计算括号内的加法，和为9.7：
=6.42×9.7
把9.7变化为10-0.3
=6.42×(10-0.3)
=6.42×10-6.42×0.3
=64.2-1.926
=62.274

Answer 5

4.9*6.42+5.1*6.42=（4.9+5.1）*6.42=10*6.42=64.2