脱式计算(能简算的要简算)2.4×58+84×1.2112÷55556438×3637817÷23+123×917429×[1-(34-38)].-数学
题文
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答案
①2.4×58+84×1.2 =2.4×58+42×2.4, =2.4×(58+42), =2.4×100, =240; ②38×
=(37+1)×
=37×
=36+
=36
③
=
=
=
④112÷55
=112÷
=112÷
=112÷
=112×
= |
题文
|
答案
①2.4×58+84×1.2 =2.4×58+42×2.4, =2.4×(58+42), =2.4×100, =240; ②38×
=(37+1)×
=37×
=36+
=36
③
=
=
=
④112÷55
=112÷
=112÷
=112÷
=112×
= |