3.5×9.9 +0.35的简便运算
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3.5×9.9 +0.35的简便运算
3.5×9.9 +0.35的简便运算
3.5×9.9 +0.35的简便运算
=3.5×+3.5×01
=3.5×(9.9+0.1)
=3.5×10
=35
0.1×3.5 9.9×3.5=3.5×(9.9 0.1)=3.5×10=35
=0.35X99+0.35
=0.35(99+1)
=0.35 X100
35
解 原式=3.5×9.9+3.5×0.1
=3.5×(9.9+0.1)
=3.5×10
=35
3.5x9.9+0.35
=3.5x(10-0.1)+0.35
=3.5x10-3.5x0.1+0.35
=35-0.35+0.35
=35