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42 98简便计算

42*98=42*(100-2)=42*100-42*2=4200-84=4116

98乘42=(100-2)*42=4200-84=4116

⒍42-⒉98的简便运算;⒍42-⒉98=6.42-(3-0.02)=6.42-3+0.02=3.42+0.02=3.44

98*4.2+42*0.2简便计算98*4.2+42*0.2=98*4.2+4.2*2=4.2*(98+2)=4.2*100=420

98*42=(100-2)*42=100*42-2*42=4200-84=4116

答:简便算法是:42*98=42X(100-2)=42X100-42X2=4200-84=4116

42*98=42X100-42X2=4200-84=4116102*56=100X56+2X56=5600+112=5712128+28+72=128+(28+72)=128+100=228

答:简便算法是:42*98=42X(100-2)=42X100-42X2=4200-84=4116

(1)42*98+42*2 =42*(98+2)=42*100=4200; (2)41*49-49 =(41-1)*49=40*49=1960; (3)5*34*4 =(5*4)*34=20*34=680;(4)(125*12)*8 =125*8+12*8=1000+96=1096; (5)700÷25÷4=700÷(25*4)=700÷100=7;(6)72*102=72*100+72*2=7200+144=7344.

(120-54)(42+98)=66x140=60x140+6x140=8400+840=9240

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