Question

我有几道初一数学题不会了，急急急！

Answer 1

6、4×2.5 100
7、5/13 0.25
8、1000
9、C
10、（1）=(0.25×4)的2012次方×4-(8×0.5³)的100次方
=4-1
=3
（2）=(2×4×0.125)的4次方
=1

Answer 2

解：
6.4²×5² = (20)²=400
7.(5/13)^200 × (2又3/5)^199 = 5/13 ×(5/13×13/5)^199 = 5/13
2^10 × (-0.5)^12 = 2^10 × 0.5^12 = (2×0.5)^10 × 0.5² = 0.25
8.(xy)^3n = (x^n * y^n)³ = （2×5）³ = 1000
9.B
10
(1)
原式=(0.25×4)^2012 × 4 - (8×0.5)^100 × (0.5)^200
=4 - 4^100 × (0.5)^200
=4 - (4×0.5)^100 × (0.5)^100
=4 - 2^100 × (0.5)^100
=4 - (2×0.5)^100
=4 - 1
=3
(2)
原式=(2×4×0.125)^4
=(8×0.125)^4
=1

Answer 3

用^表示乘方
(0.25^2012)*4^2013-8^100*0.5^300
=4*(0.25*4)^2012-(2^3)^100*0.5^300
=4*1^2012-2^300*0.5^300
=4-(2*0.5)^300
=4-1
=3

Answer 4

第6题