计算:(1)-10+8÷(-2) 3 -(-2) 2 ×(-3)(2) - 2 2 - (-1) 2005 ×( 1 3 - 1
计算:(1)-10+8÷(-2)3-(-2)2×(-3)(2)-22-(-1)2005×(13-12)÷16+(-3)2(3)先化简,再求值:(4m+n)-[1-(m-4...
计算:(1)-10+8÷(-2) 3 -(-2) 2 ×(-3)(2) - 2 2 - (-1) 2005 ×( 1 3 - 1 2 )÷ 1 6 + (-3) 2 (3)先化简,再求值:(4m+n)-[1-(m-4n)],其中m= 2 5 ,n=-1 1 3 .
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(1)-10+8÷(-2) 3 -(-2) 2 ×(-3) =-10+8÷(-8)-4×(-3) =-10-1+12 =1; (2) - 2 2 - (-1) 2005 ×(
=-4-(-1)×(-
=-4-1×
=-4-1+9 =4; (3)(4m+n)-[1-(m-4n)] =4m+n-(1-m+4n) =4m+n-1+m-4n =(4+1)m+(1-4)n-1 =5m-3n-1; 将m=
上式=5×
=2+4-1 =5. |
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