6.8×+0.32×4.2﹣8÷251+2+3+4+…+106（x﹣5）+2x=2=．
93.6÷[(54.8+45.2)×0.06]
0.8+0.55+1.2-0.45
+-
1--
口算。+=-=+=-+= 0.63×1000= 0. 75-0.25= 0.07+0.03= 0. 9÷0.03= 0.4×0.8=
+0.32×4.2﹣8÷25
+2
+3
+4
+…+10
=
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