如题所述
75Ã102
=75*ï¼100+2ï¼
=75*100+75*2
=7500+150
=7650
1.2Ã2.5
=ï¼1+0.2ï¼*2.5
=1*2.5+0.2*2.5
=2.5+0.5
=3
90.1-9.9
=ï¼90+0.1ï¼-ï¼10-0.1ï¼
=90+0.1-10+0.1
=80+0.2
=80.2
90.1Ã9.9
=ï¼90+0.1ï¼*ï¼10-0.1ï¼
=900-9+1-0.01
=908-0.01
=907.99
3.54Ã99+3.54
=3.54*99+3.54*1
=3.54*ï¼99+1ï¼
=3.54*100
=354
272÷125
=272*8/125*8
=2176/1000
=2.176
201+202+203+204+•••+1000
=ï¼201+1000ï¼+ï¼202+999ï¼+ãããã+ï¼600+601ï¼
=400个1201ç¸å
=400*1201
=480400
=75*ï¼100+2ï¼
=75*100+75*2
=7500+150
=7650
1.2Ã2.5
=ï¼1+0.2ï¼*2.5
=1*2.5+0.2*2.5
=2.5+0.5
=3
90.1-9.9
=ï¼90+0.1ï¼-ï¼10-0.1ï¼
=90+0.1-10+0.1
=80+0.2
=80.2
90.1Ã9.9
=ï¼90+0.1ï¼*ï¼10-0.1ï¼
=900-9+1-0.01
=908-0.01
=907.99
3.54Ã99+3.54
=3.54*99+3.54*1
=3.54*ï¼99+1ï¼
=3.54*100
=354
272÷125
=272*8/125*8
=2176/1000
=2.176
201+202+203+204+•••+1000
=ï¼201+1000ï¼+ï¼202+999ï¼+ãããã+ï¼600+601ï¼
=400个1201ç¸å
=400*1201
=480400
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