两道简便运算7.2x4.6+46x0.289.8x3.6+7.2x0.1

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两道简便运算7.2x4.6+46x0.289.8x3.6+7.2x0.1
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两道简便运算7.2x4.6+46x0.289.8x3.6+7.2x0.1
两道简便运算
7.2x4.6+46x0.28
9.8x3.6+7.2x0.1

两道简便运算7.2x4.6+46x0.289.8x3.6+7.2x0.1
7.2x4.6+46x0.28
=7.2x4.6+4.6x10x0.28
=7.2x4.6+4.6x2.8
=4.6x(7.2+2.8)
=4.6x10
=46
9.8x3.6+7.2x0.1
=9.8x3.6+3.6x2x0.1
=9.8x3.6+3.6x0.2
=3.6x(9.8+0.2)
=3.6x10
=36

7.2x4.6+46x0.28
=7.2×4.6+4.6×2.8
=（7.2+2.8）×4.6
=10×4.6
=46
9.8x3.6+7.2x0.1
=9.8×3.6+3.6×0.2
=（9.8+0.2）×3.6
=10×3.6
=36

7.2x4.6+46x0.28
=7.2x4.6+4.6x2.8
=（7.2+2.8）x4.6
=46
9.8x3.6+7.2x0.1
=4.9x7.2+7.2x0.1
=（4.9+0.1）x7.2
=36

7.2×4.6+46×0.28
=7.2×4.6+4.6×2.8
=4.6×（7.2+2.8）
=4.6×10
=46
9.8×3.6+7.2×0.1
=（10-0.2）×3.6+0.72
=36-0.72+0.72
=36

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