问题
解答题
33×44+44×55+55×66-66×77．
答案
33×44+44×55+55×66-66×77
=3×11×4×11+4×11×5×11+5×11×6×11+6×11×7×11，
=11×11×（3×4+4×5+5×6-6×7），
=121×20，
=2420．
搜题请搜索小程序“爱下问搜题”
33×44+44×55+55×66-66×77．
33×44+44×55+55×66-66×77
=3×11×4×11+4×11×5×11+5×11×6×11+6×11×7×11，
=11×11×（3×4+4×5+5×6-6×7），
=121×20，
=2420．
A: Hello! Is that Mike speaking? B: ___小题1:___ A: Mike, do you enjoy your new school? B: Yes, very much. But things are quite different here. A: Really? ___小题2:___ B: Yes, I go to school every day. But on Friday afternoon we do a lot of activities in the school clubs. A: Sounds great! ___小题3:___ B: Seven subjects. They are English, math, history, science, physics, art and P.E.. A: __ 小题4:___ B: I like math best. My math teacher says I am doing well in it. A: __ 小题5:___
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