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75×102
=75*(100+2)
=75*100+75*2
=7500+150
=7650
1.2×2.5
=(1+0.2)*2.5
=1*2.5+0.2*2.5
=2.5+0.5
=3
90.1-9.9
=(90+0.1)-(10-0.1)
=90+0.1-10+0.1
=80+0.2
=80.2
=75*(100+2)
=75*100+75*2
=7500+150
=7650
1.2×2.5
=(1+0.2)*2.5
=1*2.5+0.2*2.5
=2.5+0.5
=3
90.1-9.9
=(90+0.1)-(10-0.1)
=90+0.1-10+0.1
=80+0.2
=80.2
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