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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

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、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 6、400-273...

12×(40-5) =12×40-12×5 =480-60 =420 64×9-14×9 =(64-14)×9 =50×9 =450 35×98 =35×(100-2) =35×100-35×2 =3500-70 =3430 23×134-34×23 =23×(134-34) =23×100 =2300

3.4+3.4×99 =3.4×1+3.4×99

几位数的?加减乘除?简单运算多少以内的?你告诉我我写纸上给你发过来你看可以不?

1) 66x+17y=3967 25x+y=1200 答案:x=48 y=47 (2) 18x+23y=2303 74x-y=1998 答案:x=27 y=79 (3) 44x+90y=7796 44x+y=3476 答案:x=79 y=48 (4) 76x-66y=4082 30x-y=2940 答案:x=98 y=51 (5) 67x+54y=8546 71x-y=5680 答案:x=80 y=59 (6) 42x-...

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

题目呢。。

1. (25%-695%-12%)*36 2. 3/4*3/5+3/4*2/5 3. (1-1/4+8/9)/7/9 4 2/3+1/6/3/24+2/21 5 1*8/15*3/5 6 10-3/4/9/10-1/6 7 [(1/3+1/2)/5/6-1/3]/1/7 8 2/3/5+3/5/2+3/4 9 1/[(2-2/3/1/2)]*2/5 10 3^2*3.25678 11 3^3-5 12 4^2-34% 13 3.25-315% 14 ...

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