脱式计算(能简算的要简算)(1) 6 7 ÷[( 4 7 - 1 2 )× 2 5 ]
脱式计算(能简算的要简算)(1)67÷[(47-12)×25](2)1415×25%-1115÷4(3)1.28×2.37-2.8×0.237(4)(512+119)×1...
脱式计算(能简算的要简算)(1) 6 7 ÷[( 4 7 - 1 2 )× 2 5 ] (2) 14 15 ×25%- 11 15 ÷4 (3)1.28×2.37-2.8×0.237(4) ( 5 12 + 1 19 )×12+ 7 19 .
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段干妙阳
推荐于2016-01-29
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(1) ÷[( - )× ] = ÷[ × ] = ÷ = ×35 =30;
(2) ×25%- ÷4 = × - × =( - )× = × = ;
(3)1.28×2.37-2.8×0.237 =1.28×2.37-0.28×2.37 =(1.28-0.28)×2.37 =1×2.37 =2.37;
(4)( + )×12+ = ×12+ ×12+ =5+( + ) =5+1 =6. |
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