简便运算.(1)578-298(2)( 1 6 + 1 9 - 1 12 )×4×9(3)2.5×
简便运算.(1)578-298(2)(16+19-112)×4×9(3)2.5×(1.9+1.9+1.9+1.9)(4)3.64÷4+4.36×25%...
简便运算.(1)578-298(2)( 1 6 + 1 9 - 1 12 )×4×9(3)2.5×(1.9+1.9+1.9+1.9)(4)3.64÷4+4.36×25%
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(1)578-298 =578-300+2 =278+2, =280; (2)(
=(
=
=6+4-3, =7; (3)2.5×(1.9+1.9+1.9+1.9) =2.5×(1.9×4), =2.5×4×1.9, =10×1.9, =19; (4)3.64÷4+4.36×25% =3.64×
=(3.64+4.36)×
=8×
=2. |
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