15.5+24.5×8.6用简便计算?
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15.5+24.5×8.6
=5×3.1+5×4.9×8.6
=5×(3.1+4.9×8.6)
=5×(3.1+5×8.6-8.6×0.1)
=5×45.24
=226.2
=5×3.1+5×4.9×8.6
=5×(3.1+4.9×8.6)
=5×(3.1+5×8.6-8.6×0.1)
=5×45.24
=226.2
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15.5+24.5×8.6
=15.5+24.5×1+24.5×7.6
=(15.5+24.5)+24.5×2×3.8
=40+49×3.8
=40+50×3.8-1×3.8
=40+190-3.8
=230-4+0.2
=226.2
=15.5+24.5×1+24.5×7.6
=(15.5+24.5)+24.5×2×3.8
=40+49×3.8
=40+50×3.8-1×3.8
=40+190-3.8
=230-4+0.2
=226.2
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