cfyx110
(1)1/8×1001-0.125
=1/8×1001-1/8
=1/8×(1001-1)
=1/8×1000
=125
(2)3.95²-3.95×3.94
=3.95×(3.95-3.94)
=3.95×0.01
=0.0395
(3)16.8×7/32+7.6×7/16
=16.8×(7/16)×(1/2)+7.6×(7/16)
=8.4×(7/16)+7.6×(7/16)
=(8.4+7.6)×(7/16)
=16×(7/16)
=7
(4)5×998+10
=5×998+5×2
=5×(998+2)
=5×1000
=5000