简便运算3.6x42.3x3.75-12.5x0.423x28-搜答案-神马作文网

2.5×3×3.1+2.5×3.1＝2.5×〔2.3×3+3.1〕＝25

再答：望采纳啊再答：已通知提问者对您的回答进行评价，请稍等

(0.75x42.6-0.574x25+57.4)/3=(0.75x42.6-57.4x0.25+57.4x1)/3=(0.75x42.6+57.4x1-57.4x0.25)/3=[0.75x42.6

（o.75x42.6—o.574x25+57.4)÷3=（o.75x42.6+（—57.4x0.25+57.4）)÷3=0.75x(42.6+57.4)÷3=0.25x100=25

56.9*（42+57+1）=56.9*100=5690

7.2x4.6+46x0.28=7.2x4.6+4.6x10x0.28=7.2x4.6+4.6x2.8=4.6x(7.2+2.8)=4.6x10=469.8x3.6+7.2x0.1=9.8x3.6+3

(17/25x3/50)x30/51x125=(17*3*30*125)/(25*50*51)=(17*3*10*3*25*5)/(25*10*5*17*3)=3

=0.25×（4×0.8）×1.25=（0.25×4）×（0.8×1.25）=1×1=1再答：二十年教学经验，专业值得信赖！如果你认可我的回答，敬请及时采纳，在右上角点击“评价”，然后就可以选择“满意

79^2+79X42+21^2=79^2+2X79X21+21^2=(79+21)^2=100^2=10000

56.9x42+5.69x570+56.9＝56.9x42+56.9x57+56.9x1＝56.9x（42+57+1）＝56.9x100＝5690

9/2x4/5x3/8简便运算

9/2x4/5x3/8=9/2x(4/5x3/8)=9/2x3/5=27/10

再问：

3.5x3.5+3.5x97.5-3.5=3.5x（3.5+97.5-1）=3.5x100=350再问：为什么是减1呢再答：最后面-3.5那一项，提取公因数3.5不就是-1了吗3.5x3.5+3.5x

8.84*3/7+11.16/(2+1/3)+3/7=8.84*3/7+11.16*3/7+3/7=3/7*(8.84+11.16+1)=3/7*21=9

24x3/5+3/5=(24+1)x3/5=25x3/5=152/3x4/7x3/10=(2/3x3/10)x4/7=1/5x4/7=4/35

=33.3×（6.66+3.34）=333再答：亲，给个好评吧

13.6x42.3x3.75—12.5x0.423x28=42.5*(13.6*15/4-4.5)=42.5*(3.4*15-4.5)=42.5*46.5=44.5^2-4=1976.2516x14.

1x2分之2010+2x3分之2010+3x4分之2010+4x5分之2010+5x6分之2010=2010×[1/(1×2)+1/(2×3)+1/(3×4)+1/(4×5)+1/(5×6)]=201

12.5x0.25x3.2=（12.5×0.8）x（0.25x4）=10×1=10