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347+ 299,360÷45简便计算

360×10+8-12-13+4+12+15-4+13-16=3609

246×7+360+355+347 =(250-4)×7+360+360-5+360-13 =1750-28+360×3-(5+13) =1750-28+1080-18 =1750+1080-(28+18) =2830-46 =2830-50+4 =2780+4 =2784

原式=354x7+354+6+354+1+354-7=354x7+354x3+7-7=354x(7+3)=354x10=3540

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

=355×7-7+355+5+355+355-8 =355×10-10=3540

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