Question

78×9.9＋0.78 怎么简算

同上

Answer 1

78×9.9＋0.78=78×(10-0.1)+0.78=780-7.8+0.78=780-(7+0.8)+0.78=c-0.8+0.78=(780-7)-(0.8-0.78)=783-0.02=787.98

Answer 2

78×9.9+0.78=0.78×990+0.78=0.78×(990+1)

Answer 3

【问问】王去死吧