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(9.5%1.2x4)x0.6简算

(1)125×25×8×0.4=(125×8)×(25×0.4)=1000×10=10000(2)404×25=(400+4)×25=25×400+25×4=10100(3)497×99+497=497×(99+1)=497×100=49700(4)x+x4=45 54x=45 54x×45=45×45 x=1625(5)50%x+5=40 50%x+5-5=40-5 50%x×2=35×2 x=70(6)20...

8x÷6=0.24 x÷6 = 0.24÷8 = 0.03 x = 6*0.03 = 0.18 2.4*4-2.9x=3.8 9.6-2.9x=3.8 2.9x=9.6-3.8=5.8 x=2 1.8÷0.6x=3 0.6x=1.8÷3=0.6 x=1 6.12*0.5+0.6x=7.2 6.12*5+6x=72 30.6+6x=72 5.1+x=12 x=12-5.1 = 6.9 18.6-0.6x=13.8 31-x=23 x=31-23=8 1...

5.7-1.9x0.2÷7.6 =5.7-0.2÷4 =5.7-0.05 =5.65 3.4÷(0.5+0.3x4) =3.4÷(0.5+1.2) =3.4÷1.7 =2 0.648÷[(0.4+0.5)x0.6] =0.648÷(0.9x0.6) =0.648÷0.54 =1.2

1/(1×2×3×4)+1/(2×3×4×5)+1/(3×4×5×6)+...+1/(7×8×9×10) =(1/3)×[1/(1×2×3)-1/(2×3×4)]+(1/3)×[1/(2×3×4)-1/(3×4×5)]+(1/3)×[1/(3×4×5)-1/(4×5×6)]+...+(1/3)×[1/(7×8×9)-1/(8×9×10)] =(1/3)×[1/(1×2×3)-1/(2×3×4)+1/(2×3×4)-1/(3×4×5)...

3.6x5.7+3.67 =20.52+3.67 =24.19 2.57x99+2.57 =2.57x(99+1) =2.57x100 =257 5.3-0.6x0.24 =5.3-0.144 =5.156 3.9x4.5+4.5x6.1 =(3.9+6.1)x4.5 =10x4.5 =45 1.25x27x0.8 =1.25x0.8x27 =1x27 =27 2.5x(40+4+0.4) =2.5x4x11.1 =10x11.1 =111

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