用简便方法计算. 6×915
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用简便方法计算.
6×9
(1)6×9
1 5+9.2×4 2 5+9 1 5, =(6+4 2 5+1)×9.2, =11.4×9.2, =104.88; (2)(3.75+4.1+2.35)×9.8, =(6.1+4.1)×9.8, =10.2×9.8, =10×9.8+0.2×9.8, =98+1.96, =99.96. |