Question

简便运算！！急！

一。3.4*99+3.4
二。78*99
三。567+99
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过程！谢谢！！

Answer 1

3.4*（100-1）=340-3.4=336.6

78*（100-1）=7800-78=7722

567+100-1=667-1=666

Answer 2

(1)原式=3.4*(99+1)=3.4*100=340
(2)原式=78(100-1)=7800-78=7722
(3)原式=567+100-1=667-1=666

Answer 3

1 3.4*(99+1)=3.4*100=340
2 78*(100-1)=780-78=702
3 567+100-1=666

Answer 4

Answer 5

3.4*100
78*100-78
567*100-567