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(7.5一2.3x0.4)÷0.02脱式计算

原式=(7.5-0.92)÷0.02 =6.58÷0.02 =329

80%x3分之7+0.8x2分之7-4分之5x1分之7 =(0.8/7)×(3+2-1) =0.8×4/7 =3.2/7 =32/70 =16/35

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