Question

求一道四年级应用题： （ ）×49＋72×51＋34×49，（ ）内填什么数能使计算简便？

Answer 1

填38
38×49+72×51+34×49
=（38+34）×49+72×51
=72×49+72×51
=72×（49+51）
=72×100
=7200

Answer 2

94*49+72*51+34*49
=(94+72+34)*(49+51+49)
=200*149
=29800

Answer 3

（ 94）×49＋72×51＋34×49能使计算简便

200-72-34=94

Answer 4

0

Answer 5

填49
49×49＋72×51＋34×49
=49×（ 49+51+34）
=49×134
=6566

Answer 6

(38)×49+72×51+34×49
=49×(38+34)+72×51
=49×72+72×51
=72×(49+51)
=72×100
=7200