脱式计算.(能简算的要简算)6.8×0.26+3.75(9-2.35)×0.484×O.8×2.5×1.252.75×102.
(1)6.8×0.26+3.75 =1.768+3.75, =5.518; (2)(9-2.35)×0.48, =6.65×0.48, =3.192; (3)4×O.8×2.5×1.25, =(4×2.5)×(O.8×1.25), =10×1, =10; (4)2.75×102, =2.75×(100+2), =2.75×100+2.75×2, =275+5.5, =280.5. |
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