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347+ 299,360÷45简便计算

347+ 299 =347+300-1 =647-1 =646 360÷45 =360÷9÷5 =40÷5 =8

360×10+8-12-13+4+12+15-4+13-16=3609

=354x7+354+6+354-19+354-7 =354x(7+1+1+1)-20 =3540-20=3520

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