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150x98 2x160的简便计算

152x98=152x100-2x152=15200-304=14896

42x98 +2x42=42*(98+2)=42*100=4200

2x68+68x98=68x(2+98)=68x100=6800

=150x(63+36+1)=150x100=15000

123x98+2x123=123*(98+2)=123*100=12300

200-2x=120 解:2x=200-1202x=80 x=80÷2 x=40

78x160=78x100+78x60=7800+4680=12480.78x160=80x160-2x160=12800-320=12480

75x(100一2)=75x100+75x2=7500+150=7650

8.69X98=8.69X(100-2)=8.69X100-8.69X2=869-17.38=851.62

原式=(100-1)*98=100*98-1*98=9800-98=9702~一刻永远523为你解答,祝你学习进步~~~希望可以及时“选为满意答案”,你的采纳是我前进的动力~~~

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