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20道简便运算带答案

(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

4.8×10.1 =4.8×10+4.8×0.1 =48+0.48 =48.48 4.5×0.99 =4.5×1-4.5×0.01 =4.5-0.045 =4.455 3.4+3.4×99 =3.4×100 =340 187.7×11-187.7 =187.7×10 =1877 12×12/13 =12×13/13-12/13 =12-12/13 = 11又12/13 24×11/23 =11-1-1/23 =9又22/23 6/5...

4.8×10.1 =4.8×10+4.8×0.1 =48+0.48 =48.48 4.5×0.99 =4.5×1-4.5×0.01 =4.5-0.045 =4.455 3.4+3.4×99 =3.4×100 =340 187.7×11-187.7 =187.7×10 =1877 12×12/13 =12×13/13-12/13 =12-12/13 = 11又12/13 24×11/23 =11-1-1/23 =9又22/23 6/5...

如图

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...

99+(38+101)=238 125×64=8000 500-99-1-98-2=300 260÷13÷2=10 101+202+303=606 373-(173+40)=160 125×15×8×6=90000 25×32×125=100000 125×(6×8)=6000 25×(4×12)×5=6000 898-133-67=698 360÷8÷5=9 (363+95)+(37+105)=...

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(1)2.65×1.7+13.5×0.17 (2)19.94+99.7×99.8 (3)19.98×37-199.8×1.9+1.998×20 (4)0.525÷13.125÷4×85.2 (5)7.5×2.3+1.9×2.5+22.5×0.4 (6)26.39+26.39×83-263.9×1.9 (7)5.1×0.68×7.8÷(1.7×0.34×1.3) (8)4.5×7.5×4.8÷(1.5×2.5×2.4) (9)0.1+0.2+0.3+…...

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...

15x25+85x25 =(15+85)x25 =100x25 =2500

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