Question

14.7乘98加14减7乘30减去128乘4减7怎么简便运算？

Answer 1

14.7×98+14.7×30-128×4.7
=14.7×(98+30)-128×4.7
=128×(14.7-4.7)
=128×10
=1280

Answer 2

14.7×98+14.7×30-128×4.7
=14.7×(98+30)-128×4.7
=14.7×128-128×4.7
=128×(14.7-4.7)
=128×10
=1280

Answer 3

依题意可得，
14.7×98+14-7×30-128×4-7
=14.7×(100-2)+(14-7)-210-512
=147-29.4+7-210-512
=-597.6

Answer 4

l4.7×98＋l4一7×30一128×4一7
＝l4.7×100一l4.7x2十l4一210一l3o×4十2x4一7
＝l47一29.4＋14一2lo一520十8－7
＝l47＋15一29.4一2l0一520
二162一759.4
＝一597.4

Answer 5

14.7×98+14.7×30-128×14.7
=14.7×（98+30-128）
=14.7×（128-128）
=14.7×0
=0