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简介:
1.16×77+16×23
=16×(77+23)
=16×100
=1600
2.28×30+30×22
=30×(28+22)
=30×50
=1500
3.32×27+18×27
=27×(32+18)
=27×50
=1350
4.125×64
=125×8×8
=1000×8
=8000
5.76×101
=76×(100+1)
=76×100+76×1
=7600+76
=7676
6.695-134+105-166
=(695+105)-(134+166)
=800-300
=500
7.56+31+24
=(56+24)+31
=80+31
=111
8.615+475+125
=615+(475+125)
=615+600
=1215
9.125×64
=125×8×8
=1000×8
=8000
10.89+101+111
=101+(89+111)
=101+200
=301