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脱式计算(1)6760÷13+17×25(2)4.82%5.2÷0.8×0.6...

(1)6760÷13+17×25,=520+17×25,=520+425,=945;(2)4.82-5.2÷0.8×0.6,=4.82-6.5×0.6,=4.82-3.9,=0.92;(3)56-34÷310,=56-52,=-53;(4)35÷78×1-27,=40×1-27,=40-27,=3957.

13×17×(2/13-0.125)÷7/6÷(1-1/2-1/8) =13×17×(2/13-1/8)×6/7÷3/8 =17×(2/13×13-1/8×13)×6/7×8/3 =17×(2-13/8)×16/7 =17×3/8×16/7 =102/7

408-12×24 = 408 - 288 = 120 (46+28)×60 = 74 x 60 = 4440 42×50-17 = 2100- 17 = 2083 32+105÷5 = 32 + 21 = 53 420×(327-238) = 420 x 89 = 37380 (4121+2389)÷7 = 6510 ÷7 = 930 3.416÷(0.016×35) = 3.416 ÷0.56 = 6.1 0.8×[(10...

(1)14-7.2-2.8 =14-(7.2+2.8)=14-10=4; (2)5.5×17.3+6.6×5.5+0.1×5.5=5.5×(17.3+6.6+0.1)=5.5×24=132;(3)13.7÷12.5÷0.8=13.7÷(12.5×0.8)=13.7÷10=1.37.

(1)原式=-1-0.5×13×(-7)=-1+76=16;(2)原式=90°-40°39′+3°16′40″=93°16′40″-40°39′=52°37′40″;(3)原式=-4×54×(-120)=14;(4)原式=x3-2y3-3x2y-3x3+3y3+7x2y=(1-3)x3+(-2+3)y3+(-3+7)x2y=-2x3+y3+4x2y.

12.75-5/17+1/4 =12.75+0.25-5/17 =13-5/17 =12又12/17 , 1.3x1/4-0.5x25%-0.2÷4 =1.3x1/4-0.5x1/4-0.2x1/4 =(1.3-0.5-0.2)x1/4 =0.6x1/4 =0.15 , 7分之6×15分之13×65分之7 =6/7x(13/15x7/65) =6/7x7/75 =2/25 , 86.48÷{(3.45+4.65)×0....

=24*12分之5+24*8分之3-24*4分之1 =10+9-6

210

408-12×24 = 408 - 288 = 120 (46+28)×60 = 74 x 60 = 4440 42×50-17 = 2100- 17 = 2083 32+105÷5 = 32 + 21 = 53 420×(327-238) = 420 x 89 = 37380 (4121+2389)÷7 = 6510 ÷7 = 930 3.416÷(0.016×35) = 3.416 ÷0.56 = 6.1 0.8×[(10...

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