脱式计算(能简算的要简算)17.64÷4.9+6.73 3.4÷[(1.2+0
脱式计算(能简算的要简算)17.64÷4.9+6.733.4÷[(1.2+0.5)×5]1.9+19.9+199.9+0.30.25×12.5×3.2....
脱式计算(能简算的要简算)17.64÷4.9+6.73 3.4÷[(1.2+0.5)×5] 1.9+19.9+199.9+0.3 0.25×12.5×3.2.
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(1)17.64÷4.9+6.73 =3.6+6.73, =10.33; (2)3.4÷[(1.2+0.5)×5] =3.4÷[1.7×5], =3.4÷1.7÷5, =2÷5, =0.4; (3)1.9+19.9+199.9+0.3 =1.9+19.9+199.9+0.1+0.1+0.1, =(1.9+0.1)+(19.9+0.1)+(199.9+0.1), =2+20+200, =222; (4)0.25×12.5×3.2 =0.25×12.5×0.8×4, =(0.25×4)×(12.5×0.8), =1×10, =10. |
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