Question

49×72-49×61-49简便运算

49×72-49×61-49简便运算

Answer 1

38×49+49×61+49
=49×(38+61+1)
=49×100
=4900
108×29+108×70+108
=108×(29+70+1)
=108×100
=10800
1800—（820+650÷13）
=1800-(820+50)
=1800-(800+70)
=1800-800-70
=1000-70
=930
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Answer 2

49×72-49×61-49
=49×（72-61-1）
=49×10
=490

Answer 3

49×72-49×61-49
=49×（72-61-1）
=49×10
=490

Answer 4

49×72-49×61-49
=49×(72-61-1)
=49×10
=490