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零点三七加八十九点五八点五点七二点零点,二八加...

简便计算 0.37+89.58+5.72+0.28+1.63+1.42 =(0.37+1.63)+(89.58+1.42)+(5.72+0.28) =2+91+6 =99

3又4/5×0.375+3.8÷8+1/2÷5/19 =3.8×3/8+3.8×1/8+1/2×3.8 =3.8×(3/8+1/8+1/2) =3.8×1 =3.8

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