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3.21×4.7+32.1×0.531.5×2.4这两道题简算

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答案和解析
3.21×4.7+32.1×0.53
=3.21×4.7+3.21×5.3
=3.21×(4.7+5.3)
=3.21×10
=32.1
1.5×2.4
=1.5×(2+0.4)
=1.5×2+1.5×0.4
=3+0.6
=3.6