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7+66.3= ÷ = × ÷ = 8.9×11-8.9=
14÷ = ÷20%= ( + )×20= + × =
1- = ×12= 8×50%= 1.25×2×0.8=
4.21+9= ÷ = + ×0= 8.5- - =
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