N435 ......,............

Question

N435 ......,............

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Answer 1

1) 34x+66x=x·(34+66)=100x, x=8, 8·100=800;
2) 54a-39a=3a·(18-13)=3a·5=15a, a=26, 26·15=390;
3) 18m-5m+7m=m·(18-5+7)=20m, m=394, 20·394=7880;
4) 19z-12z+33z-192=z·(19-12+33)-192=40z-192, z=82, 40·82-192=3280-192=3088.

Comments

спасибо