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4.8×10.1
=4.8×10+4.8×0.1
=48+0.48
=48.48
4.5×0.99
=4.5×1-4.5×0.01
=4.5-0.045
=4.455
3.4+3.4×99
=3.4×100
=340
187.7×11-187.7
=187.7×10
=1877
12×12/13
=12×13/13-12/13
=12-12/13
= 11又12/13
24×11/23
=11-1-1/23
=9又22/23
6/5-2/7+4/5-5/7
=(6/5+4/5)-(2/7+5/7)
=2-1
=1
=4.8×10+4.8×0.1
=48+0.48
=48.48
4.5×0.99
=4.5×1-4.5×0.01
=4.5-0.045
=4.455
3.4+3.4×99
=3.4×100
=340
187.7×11-187.7
=187.7×10
=1877
12×12/13
=12×13/13-12/13
=12-12/13
= 11又12/13
24×11/23
=11-1-1/23
=9又22/23
6/5-2/7+4/5-5/7
=(6/5+4/5)-(2/7+5/7)
=2-1
=1
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