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12.5*88.8的简便方法

12.5*88.8 =12.5x8x11.1 =100x11.1 =1110

1)8.88×12.5 =(1.11×8)×12.5 =1.11×(8×12.5) =1.11×100 =111 2)8.88×12.5 =(8+0.8+0.08)×12.5 =8×12.5+0.8×12.5+0.08×12.5 =100+10+1 =111

8.88×12.5 =(1.11x8)x12.5 =1.11x(8x12.5) =1.11x100 =111

8.88*12.5 =1.11*8*12.5 =1.11*(8*12.5) =1.11*100 =111 8.88*12.5 =(8+0.8+0.008)*12.5 =8*12.5+0.8*12.5+0.08*12.5 =100+10+1 =111 8.88*12.5 =(8.88/8)*(12.5*8) =1.11*100 =111

8.88×12.5 =8.88×100/8 =111 8.88×12.5 =8*1.11×12.5 =8*12.5*1.11 =100*1.11 =111 0.99*99 =0.99*(100-1) =99-0.99 =98.01 0.99*99 =(1-0.01)*99 =99-0.99 =98.01

①12.5×8.88=12.5×(1.11×8)=(12.5×8)×1.11=100×1.11=111②1.9+19.9+199.9+0.3=1.9+19.9+199.9+0.1+0.1+0.1=(1.9+0.1)+(19.9+0.1)+(199.9+0.1)=2+20+200=222③10.01×101-10.01=10.01×(101-1)=10.01×100=1001

=12.5x8x11.1 =100x11.1 =1110

8.88x12.5 =1.11x8x12.5 =1.11x100 =111

8.88✘12.5 =8✘12.5+0.8✘12.5+0.08✘12.5 =100+10+1 =111

8.88x12.5 = 8x12.5+0.8x12.5+0.08x12.5=100+10+1 = 111 8.88×12.5 = 888x0.125=888/8=111

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