练一练计算: (1)8×√18 (2)12×102×√3×105 (3)49÷(2y7)
练一练:计算: (1) 8 18 2 5 (2) 1.2 10 3 10 (3) 49 (2 7)
做一做 32 (1)2×√3 ④4 √2 (2)√1000×√0.1 6√50 0 (3) 32 2 V3 3×10 (7) 2.7×10 (6√24×√3 24 (8) 2√3
3 2 2 3 (3) (2) 1000 0.1 (1) 1 2 3 1 0 5 0 ( ) 2 3 2 ( ) 5 4 做一做 (6) 2 4 3 (7) 3 5 2.7 1 0 3 1 0 24 2 3 (8)