(7.7+1.54)\0.7用简便运算怎样做?
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(7.7+1.54)\0.7用简便运算怎样做?
(7.7+1.54)\0.7用简便运算怎样做?
(7.7+1.54)\0.7用简便运算怎样做?
﹙7.7+1.54﹚÷0.7
=7.7÷0.7+1.54÷0.7
=11+2.2
=13.2
展开求=7.7/0.7+1.54/0.7
=10+2
=12