6.34 -2.5*1.8+2.6 简算要式子.

6.34 -2.5*1.8+2.6 简算要式子.
6.34 -2.5*1.8+2.6 简算
要式子.

6.34 -2.5*1.8+2.6 简算要式子.
6.34 -2.5*1.8+2.6
=6.34 -2.5*1.8+2.5+0.1
=6.34 -2.5*(1.8-1)+0.1
=6.34 -2.5*0.8+0.1
=6.44 -2
=4.44

1.=2.5*0.4*8+1.9 =8+1.9 =9.9 2.=7.7*1.23 =7*1.1*1.23 =7*1.353 =9.471 3.=2.5*0.2*9+8 =0.5*9+8 =4.5+8 =

6.34=6.25+0.9=2.5*2.5+0.7
2.5（2.5-1.8）+2.6+0.7=2.5*0.7+0.7*5=0.7*7.5=5.25