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(1) (-5)×2+20÷(-4) (2)  

(1)(-5)×2+20÷(-4);=-10-5,=-15;(2) 4-5÷(- 1 2...

(1)(-5)×2+20÷(-4)=-10-5=-15;(2)-14-16×[2-(-3)2]=-1...

(1)原式=18×(-24)-13×(-24)+14×(-24)=-3+8-6=-1;(2)原式=-...

方程两边同时乘以5,除以4: 2x-0.36=25 2x=20+0.36=20.36 x=10.18

(1)-20+(-14)-(-18)-13=-20-14+18-13=-47+18=-29;  ...

(1)-20+14-3=-23+14=-9;(2)18-6÷(-2)×(-13)=18-(-3)×(...

9/20×2÷23/20=9/10×20/23=18/23

(1)原式=(-3-6-11)+(2+9)=-20+11=-9;(2)原式=16×(-24)?34×...

(1)420÷7-20  =60-20  = 40 (2)350+100×4  =350+400 ...

9/20÷【1/2×(2/5+4/5)】 =9/20÷(1/2×6/5) =9/20÷(3/5)...

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