题目
计算题
(1)
30-(-12)-(-25)-18+(-10)
(2)
(- + - ) .
(3)
-52÷(-3)2×(-5)3÷[-(-5)2]
(4)
(-2ab+3a)-(2a-b)+6ab
(5)
-[ ( - )+4 ]-
答案: 解:原式=30+12+25-18-10 =67-28 =39
解:原式=( -212+912-512 ) × ( -12 ) = 212× (-12) =-2
解:原式=-25÷9×(-125)÷(-25) = -25×19×(-125)×(−125) = -1259
解:原式=-2ab+3a-2a+b+6ab =a+b+4ab
解:原式= 12a2−(12ab−12a2+4ab)−12ab = 12a2−12ab+12a2−4ab−12ab = a2−5ab