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6^n*5^n+2/30^n
=30^n*25/30^n
=25
1-1/6*(-7)
=1+7/6
=13/6
3+3^2m+3^3m=3^21
5m=21-1 m=4
xy^2n*x^2 代入
1^2n*x^2=x^2=25

1.随便找个n代入得25
2.-1-1/2 *1/3 *(2-9)=1/6
3.3* 3∧2m * 3∧3m=3∧21
3∧(1+5m)=3∧21
m=4
4.原式=25*(xy)∧2n=25

1题 原式=(2×3×5)n×5^2÷(2×3×5)n
= 25
其他的类似,把书上的运算法则好好看

o(>___ 英语:把词补充完整1. ___ ___ t___ ___2. ___ ___ ___ ___ ___ ___ a ___ ___ ___ ___3. ___ ___ ___ g4. ___ ___ t5. ___ e ___ ___ ___ ___ ___6. ___ ___ l7. ___ ___ ___ e8. ___ ___ ___ o ___ ___ ___9. ___ n ___ ___ ___ ___ 元音音素字母发音归类a:___ ___ ___e:___ ___ __写出八个i:___ o:___u:___ ___ He ___ ___ there before nine o' clock. 手抄报内容急o(>___ We often have lunch at twelve o'clock.对at twelve o'clock提问.___ ___ ___ ___often have lunch? 找规律,填字母A ___ c ___ E f ___ H ___ J ___ ___ M ___ o P ___ r S ___ u V W x ___ Z 同义句转换 The meeting I attended finished at 10o'clock yesterday morningThe meeting I attended ___ ___ ___ ___ at 10o'clock yesterday morning 填单词使每一横行、竖行和对角线都含有5个元音字母___,___,___,___,A___,___,___,E,______,___,I,___,______,O,___,___,___U,___,___,___,___每一空填一个字母.不需要是单词!只要每一横行、竖行和对角线都含有5 写出A E I O U五个元音字母在开音节和闭音节中的发音并举例A//___//___ E//___//___I//___//___O//___//___ U//___//___ Our ___(one) class starts at 8'o clock. He ___(start) lessons at nine o'clock. It was eight o'clock when I ___ the station. he insisted that we ___(be)backbefore 10 o'clock ___ is piano lesson?It's at four o'clock. we went sightseeing in beijing and enjoyed o ___ . He eats supper at seven o'clock.(给为一般疑问句)___ he ___ suooer at seven o'clock? let's go at six o'clock.(改为反意疑问句)let's go at six o'clock,___ ___?