12.5×16+1.25×16+2.5×8+25×0.8 简便运算!
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12.5×16+1.25×16+2.5×8+25×0.8 简便运算!
12.5×16+1.25×16+2.5×8+25×0.8 简便运算!
12.5×16+1.25×16+2.5×8+25×0.8 简便运算!
12.5×16+1.25×16+2.5×8+25×0.8
=12.5×8×2+1.25×8×2+2.5×4×2+25×0.4×2
=100×2+10×2+10×2+10×2
=2×(100+10+10+10) (乘法分配律)
=2×130
=260
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=25×8+2.5×8+2.5×8+2.5×8=(25+2.5+2.5+2.5)×8=32.5×8=260
12.5×16+1.25×16+2.5×8+25×0.8
=12.5×8×2+1.25×8×2+2.5×4×2+25×0.4×2
=100×2+10×2+10×2+10×2
=2×(100+10+10+10) (乘法分配律)
=2×130
=260
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12.5×16+1.25×16+2.5×8+25×0.8 简便运算!
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