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50道脱式计算简便方法

1. 3/7 * 49/9 - 4/3 2. 8/9 * 15/36 + 1/27 3. 12* 5/6 2/9 *3 4. 8* 5/4 + 1/4 5. 6÷ 3/8 3/8 ÷6 6. 4/7 * 5/9 + 3/7 * 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 * 5/6 + 5/6 10. 3/4 * 8/9 - 1/3 11. 7 * 5/49 + 3/14 12. 6 *( 1/2 + 2/3 ) 13. 8 * 4/5 + 8 * 11/5

1)12)11/273)28/34)41/45)255/16

3乘5乘6 =15乘6 =90

6.9+4.8+3.1 0.456+6.22+3.78 15.89+(6.75-5.89)4.02+5.4+0.98 5.17-1.8-3.2 13.75-(3.75+6.48)3.68+7.56-2.68 7.85+2.34-0.85+4.66 35.6-1.8-15.6-7.23.82+2.9+0.18+9.1 9.6+4.8-3.6 7.14-0.53-2.475.27+2.86-0.66+1.63 13.35-4.68+2.65 73.8-1.64-

(80+4) *=80*25+4*25 =(5*2)*289=2000+100 =10*289=2100 =289025*125*8*4 329*101 =(25*4)*(125*8) =329*(100+1)=100*1000 =329*100+329*1=100000 =332296*72+28*6=6*(72+28)=6*100=600

1、 1.25*(8+10)=1.25*8+1.25*10=10+12.5=22.52、1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.783、1/2-(4/5-1/2)=1/2+1/2-4/5=1-4/5=1/54、4800÷25÷4=4800÷(25x4)=4800÷100=4800÷100=485、2/5-(3/8-3/5)=2/5+3/5-3/8=1-3/8=5/86、3/4-

(1) 103÷73-159-57= (2) 83*91÷131+38= (3) 197-46+67-13= (4) 38÷54*126-52= (5) 39+55-166-52= (28) 11÷55÷86÷51= (29) 71-42+50*92= (30) 177÷97-92÷4= (31) 151*9

50道脱式计算 30.8÷[14-(9.85+1.07)] [60-(9.5+28.9)]÷0.18 2.881÷0.43-0.24*3.5 20*[(2.44-1.8)÷0.4+0.15] 28-(3.4+1.25*2.4) 2.55*7.1+2.45*7.1 777*9+1111*3 0.8*[15.5-(3.21+5.79)] (31.8+3.2*4) ÷ 5 31.5*4÷(6+3) 0.64*25*7.8+2.2 2÷2.5+2.5÷2脱式

脱式计算. 408-12*24 (46+28)*60 42*50-1715÷5 32+105÷5 (108+47)*52 420*(327-238) (4121+2389)÷7 671*15-974 469*12+1492 405*(3213-3189) 5000-56*23 125*(97-81) 6942+480÷3 304*32-154 20+80÷4-20= 100÷(32-30)*0= 25*4-12*5

方程:(0.5+x)+x=9.8÷2 2(x+x+0.5)=9.8 25000+x=6x 3200=450+5x+x x-0.8x=6 12x-8x=4.8 7.5*2x=15 1.2x=81.6 x+5.6=9.4 52-x =15 91÷x =1.3 x+8.3=10.7 15x =3 3x-8=16 7(x-2)=2x+3 3x+9=2718(x-2)=270 12x=300-4x 7x+5.3=7.4 3x÷5=4.8 30÷x+

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