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12乘98简算

12*98 =12*(100-2) =12*100-2*12 =1200-24 =1176

98*99 =98*(100-1) =98*100-98*1 =9800-98 =9800-100+2 =9702

1.2*98 12*198 =1.2*(100-2) =12*(200-2 ) =1.2*100-1.2*2 =12*200-12*2 =120-2.4 =2400*24=117.6 =2376

把24写成12*2,在根据乘法分配律进行计算 =12*98+12*2=12*(98+2) =12*100 =1200

(100-2)*12=1200-24=1176

=98x(135-23-12) =98x100 =9800

(98 12)x109简便运算(98 12)x109=109*(100+10)=109*100+109*10=10900+1090=11990

1.2*198-9.8*12 =1.2*198-98*1.2=1.2*(198-98)=1.2*100=120

12x(99+999-98)

12*99 =12*(100-1) =12*100-12*1 =1200-12 =1188

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