脱式计算.(能简算的要简算) 6.8×0.75÷0.5 13.5÷2.5-2.75 0.125×0.25×32 0.9+9.9+99.9+0.3.
(1)6.8×0.75÷0.5, =68×(0.75÷0.5), =68×1.5, =102; (2)13.5÷2.5-2.75, =5.4-2.75, =2.65; (3)0.125×0.25×32, =0.125×0.25×4×8, =(0.125×8)×(0.25×4), =1×1, =1; (4)0.9+9.9+99.9+0.3, =(1-0.1)+(10-0.1)+(100-0.1)+0.3, =111-0.3+0.3, =111. |
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