solve the problem and Express the answer in the standard form and usual form a) (8.6x10^-4) x (4.2 x 10^-6
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8.6×10-⁴×4.2×10-⁶
86/10×1/10×1/10×1/10×1/10×42/10×1/10×1/10×1/10×1/10×1/10×1/10=861/10000000000
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