问题
解答题
计算: (1)(
(2)(-2)2×5-(-2)3÷4 (3)(-1+
|
答案
(1)原式
×(-42)-1 3
×(-42)+3 7
×(-42)2 21
=-14+18-4
=0;
(2)原式=4×5-(-8)÷4
=20+2
=22.
(3)原式=-1+5 2
≈-1+2.236 2
=-1+1.118
≈0.118.
计算: (1)(
(2)(-2)2×5-(-2)3÷4 (3)(-1+
|
(1)原式
×(-42)-1 3
×(-42)+3 7
×(-42)2 21
=-14+18-4
=0;
(2)原式=4×5-(-8)÷4
=20+2
=22.
(3)原式=-1+5 2
≈-1+2.236 2
=-1+1.118
≈0.118.