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简介:
0.77×101
=0.77×(100+1)
=0.77×100+0.77×1
=77+0.77
=77.77
1.01+9×1.01
=1.01×1+9×1.01
=(1+9)×1.01
=10×1.01
=10.1
0.65×201
=0.65×(200+1)
=0.65×200+0.65×1
=130+0.65
=130.65
0.45×101
=0.45×(100+1)
=0.45×100+0.45×1
=45+0.45
=45.45
2.5×9.8
=2.5×(10-0.2)
=2.5×10-2.5×0.2
=25-0.5
=24.5
102×0.85
=(100+2)×0.85
=100×0.85+2×0.85
=85+1.7
=86.7
9.4×10.1
=9.4×(10+0.1)
=9.4×10+9.4×0.1
=94+0.94
=94.94
9.5×101
=9.5×(100+1)
=9.5×100+9.5×1
=950+9.5
=959.5