用简便方法计算(要写出主要的简算过程) (1) 2 1 2 ×3.4+2.5×6 3
用简便方法计算(要写出主要的简算过程)(1)212×3.4+2.5×635(2)(687+687)×50(3)12.5×3.1×80(4)(14+13+16)÷112....
用简便方法计算(要写出主要的简算过程) (1) 2 1 2 ×3.4+2.5×6 3 5 (2)(687+687)×50 (3)12.5×3.1×80 (4) ( 1 4 + 1 3 + 1 6 )÷ 1 12 .
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(1)2
=2.5×3.4+2.5×6.6, =2.5×(3.4+6.6), =2.5×10, =25; (2)(687+687)×50, =687×2×50, =687×(2×50), =687×100, =68700; (3)12.5×3.1×80, =12.5×80×3.1, =1000×3.1, =3100; (4)(
=(
=
=3+4+2, =9. |
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