2.3×8.6+2.3×4.6+8.2×7.7简便
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=2.3x5+8.2x10=11.5+82=93.5
咨询记录 · 回答于2023-03-07
2.3×8.6+2.3×4.6+8.2×7.7简便
2.3×8.6+2.3×4.6+8.2×7.7=2.3x(8.2+0.4)+2.3×4.6+8.2×7.7=2.3x8.2+2.3x0.4+2.3×4.6+8.2×7.7=2.3x(0.4+4.6)+8.2x(2.3+7.7)
=2.3x5+8.2x10=11.5+82=93.5
哪里有0.4
8.6拆成了8.2+0.4
因为观察到后面有8.2x7.7，而2.3+7.7刚好等于10，故提示将8.6拆为8.2+0.4
谢谢
1.2×3.3-0.1×7.2
1.2×3.3-0.1×7.2=1.2x3x1.1-0.1x3.6x2=3.6x1.1-3.6x0.2=3.6x(1.1-0.2)=3.6x0.9=3.24
最后的3.6
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