初一数学题:利用提公因式法进行简便运算: (1)5×998+10 (2)16.8×7⼀32+7.6×7⼀16

2025-05-17 12:19:58
推荐回答(1个)
回答1:

(1)5×998+10
= 5x (1000 -2 ) +10
= 5000 -10 +10
=5000

(2)16.8×7/32+7.6×7/16
= 16.8 x 7/32+(7.6x2)×7/32
= ( 16.8 + 15.2 ) x 7/32
= 3 2 x 7/32
= 7