题目
计算
(1)
(2)
(3)
(4)
(5)
(6)
答案: 解: 10+8÷(−2)2−(−4)×(−3) =10+8÷4−12 =10+2−12 =0
解: (−24)÷(223)2+512×(−16)−0.52 =(−16)÷649−112×16−14 =−16×964−1112−14 =−94−1112−14 =−52−1112 =−4112
解: 0.7×1211−6.6×37−3.2÷73+0.7×911 =0.7×1211+0.7×911−6.6×37−3.2×37 =0.7×(1211+911)−37×(6.6+3.2) =0.7×2−37×9.8 =1.4−4.2 =−2.8
解: (−1)2007−{(−2)3−[3+0.4×(−112)]÷(−2)} =−1−[−8−(3−0.6)÷(−2)] =−1−(−8+1.2) =−1+8−1.2 =5.8
解: 3a−(−2a+2b−c)+(−a−4b+c) =3a+2a−2b+c−a−4b+c =2(2a−3b+c)
解: 4xy−(x2+y2)−[4xy−12(2x2−y2)] =4xy−x2−y2−4xy+x2−12y2 =−32y2