怎样算简便就怎样算:6.4× 2 5 +6 2 5 ×(1-40%); 5 12 +( 5
怎样算简便就怎样算:6.4×25+625×(1-40%);512+(56-112)÷916;1415×29×15×9;27×59+47×29....
怎样算简便就怎样算:6.4× 2 5 +6 2 5 ×(1-40%); 5 12 +( 5 6 - 1 12 )÷ 9 16 ; 14 15 × 2 9 ×15×9; 2 7 × 5 9 + 4 7 × 2 9 .
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(1)洞碰6.4×
=6.4×0.4+6.4×0.6, =6.4×(0.4+0.6), =6.4×1, =6.4; (2)
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(3)
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=14×2, =28; (4)穗返
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