lyf208617
幼苗
共回答了23个问题采纳率:82.6% 举报
36.9-10.47+3.1+0.53
=36.9+3.1-(10.47-0.53)
=40-9.41
=30.59
2.5*3.2*1.25
=2.5×4×8×1.25
=2.5×4×(8×1.25)
=10×10
=100
9.9*34
=(10-0.1)×34
=10×34-0.1×34
=340-3.4
=336.6
3.12+3.12*99
=3.12×1+3.12×99
=3.12×(1+99)
=312
3.12+6.88*1.2 (这道我不会)
=3.12+8.256
=11.376
1年前
9