2·25×0·9÷2·25×0·9要简算

2·25×0·9÷2·25×0·9要简算 18·76×9·9＋18·76 0·25×16·2×0·4 4·8×9·9 7·09×10·8 －0.8×7.09 4.8×100.1 4.2 ÷3.5 32 简便运算4.7×3.4+0.47×53+4.7×1.3 0.25×0.9÷0,·25÷0,9 0,25×0,9÷0,25×0,9 5,3×2,5+25×0,48－0,25 -1,2,-3,4,-5,6,···1,4,9,16,25···0,3,8,15,24···第一行按什么规律排列?第二三行分别与第一行有 3·2÷0·25怎样巧算还有0.8÷1.25 1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········? （11×10×9×···×2×1）÷﹙22×24×25×27﹚＝? 1*2*3*4*5*6*7*8*9*10·········*50积的末尾一共有多少个0? 有理数a、b在数轴上位置如图所示,试化简 |a-b|-|a+b|+2|b-2a|··········································b 0 a 计算下面行列式,2 1 0 0······0 01 2 1 0······0 00 1 2 1 ·····0 0············0 0 0 0······2 10 0 0 0······1 9（-2/3·x+4）2-25=0解方程 1+2+3+4+5+6+7+8+9+1+11+12+13+14+15````````1+2+3+4+5+6+7+8+9+1+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28++29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50·································· (x-25)÷7=x÷9-1一道应用题的方程,把解方程的过程写清楚,急用······· 简便计算：2·34乘9·9加0·234 找规律 1,4,9,16,25,36······a,( ) 4500÷25—14×2 简便计算!·· 根据下面的等式,写出比例式.（能写出不同的比例式吗?） 4×9＝12×3 0·2×0·5＝0·4×0·25 1 2 9 10 25 26 ··· 4 3 8 11 24 27 ··· 5 6 7 12 23 26··· 17 1816 15 14 13 22 29···1 2 9 10 25 26 ··· 4 3 8 11 24 27 ··· 5 6 7 12 23 26···16 15 14 13 22 29·· ·17 18 19 20 21 30···36 35 34 33 32 31··· ·