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20道简便运算带答案

1、56+31+24 =(56+24)+31 =80+31 =111, 2、615+475+125 =615+(475+125) =615+600 =1215 3、125×64 =125×8×8 =1000×8 =8000 4、 89+101+111 =101+(89+111) =101+200 =301 5、24+127+476+573 =(24+476)+(127+573) =500+700 =1200...

(1)101×99 =(100+1)×99 =100×99+99 =9999 (2)14×35 =7×2×35 =7×70 =490 (3)25×28 =25×4×7 =100×7 =700 (4)4×9×25 =4×25×9 =100×9 =900 (5)43×5×4 =43×20 =860 (6)15×12 =15×2×6 =30×6 =180

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62×7.1+2.9, =440.2+2.9, =443.1; 4.2×0.25, =(4+0.2)×0.25, =4×0.25+0.2×0.25, =1+0.05, =1.05; 5.2×4.3+0.8×4.3, =(5.2+0.8)×4.3, =6×4.3, =25.8. 8.5+1.5÷0.25×4, =8.5+6×4, =8.5+24, =32.5. 0.25×0.8+2.5% =0.2+2.5%, =0.225; 32×1...

3.4+3.4×99 =3.4×1+3.4×99

以后自己写!!475+254+361=470+250+360+(5+4+1)=470+250+360+10=1090615+475+125=615+(475+125)=1215860-168+159=860-(168-159)=860-9=851第四你应该抄错了,这没法简便,应该是-358第五题直接按照顺序算=476+65-(30-1)=476+65+1-30=51...

56+31+24=(56+24)+31=80+31=111 615+475+125 =615+(475+125)=615+600=1215 125×64 =125×8×8=1000×8=8000 89+101+111=101+(89+111)=101+200=301 24+127+476+573 =(24+476)+(127+573)=500+700=1200 400-273-127=400-(273+127...

类型一:(注意:一定要括号外的数分别乘括号里的两个数,再把积相加) (40+8)×25 125×(8+80) 36×(100+50) 24×(2+10) 86×(1000-2) 15×(40-8) 类型二:(注意:两个积中相同的因数只能写一次) 36×34+36×66 75×23+25×23 63×43...

(1)101×99 =(100+1)×99 =100×99+99 =9999 (2)14×35 =7×2×35 =7×70 =490 (3)25×28 =25×4×7 =100×7 =700 (4)4×9×25 =4×25×9 =100×9 =900 (5)43×5×4 =43×20 =860 (6)15×12 =15×2×6 =30×6 =180 (7)12×(40-5) =12×40-12×5 =480-60 =420 (8)64×9-14×9 ...

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