Question

计算下面各题（能简算的要简算）．9.9+1.2-9.9+1.510-3.45+2.555.58+2.74-1.581.5×10.23.8+3.22÷23×13

计算下面各题（能简算的要简算）．9.9+1.2-9.9+1.510-3.45+2.555.58+2.74-1.581.5×10.23.8+3.22÷23×1310×2.3-（3-2.03）1.25×3.6×8800+32×1712.3-（8.37-4.88）-4.51

Answer 1

（1）9.9+1.2-9.9+1.5
=9.9-9.9+1.5+1.2
=0+1.5+1.2
=2.7
 
（2）10-3.45+2.55
=6.55+2.55
=9.1
 
（3）5.58+2.74-1.58
=5.58-1.58+2.74
=4+2.74
=6.74
 
（4）1.5×10.2
=1.5×10+1.5×0.2
=15+0.3
=15.3
 
（5）3.8+3.22÷23×13
=3.8+0.14×13
=3.8+1.82
=5.62
 
（6）10×2.3-（3-2.03）
=23-3+2.03
=20+2.03
=22.03
 
（7）1.25×3.6×8
=1.25×8×3.6
=10×3.6
=36

（8）800+32×17
=800+544
=1344

（9）12.3-（8.37-4.88）-4.51
=12.3-3.49-4.51
=12.3-（3.49+4.51）
=12.3-8
=4.3